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Properties of the Number -221445

Two Hundred Twenty-One Thousand Four Hundred Forty-Five

Basics

Value: -221446 → -221445 → -221444

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 2 × 5 × 7 × 19 × 37

Divisors: 1, 3, 5, 7, 9, 15, 19, 21, 35, 37

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -110110000100000101

Octal: -660405

Duodecimal: -A8199

Hexadecimal: -36105

Square: 49037888025

Square Root: 470.579430064681

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n*(n+1)*(n-1)*(n-2)/8. A50534
T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element equal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order. A231419
Smallest triangular number which is a multiple (>1) of the n-th triangular number. A68084
Numbers that are n-gons for three or more n's, where n=3,4,5,...,16. A62712
Triangular numbers that are the product of three distinct triangular numbers greater than 1. A225440
32·a(n) is the denominator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3. A351697
Consider 2n tennis players; a(n) is the number of matches needed to let every possible pair play each other. A62346
Numbers n such that 8·n+1 is a cube. A165220
Number of (n+1)X(2+1) 0..2 arrays with no element equal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order. A231414
Number of (4+1)X(n+1) 0..2 arrays with no element equal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order. A231423