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Properties of the Number 15221

Fifteen Thousand Two Hundred Twenty-One

Basics

Value: 15220 → 15221 → 15222

Parity: odd

Prime: No

Previous Prime: 15217

Next Prime: 15227

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 31 × 491

Divisors: 1, 31, 491, 15221

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11101101110101

Octal: 35565

Duodecimal: 8985

Hexadecimal: 3b75

Square: 231678841

Square Root: 123.37341690980274

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

Number of series-reduced planted trees with n nodes. A1678
Sum of solutions of φ(x) = 2n. A58214
Denominators of continued fraction transform of e. A229596
Decimal part of a(n)1/3 starts with a 'nine digits' anagram. A34278
Integer part of the area of consecutive prime sided isosceles triangles. A97442
Volume of right regular hexagonal pyramid with height and side lengths n, rounded down. A234729
Number of (6+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254912
Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 16. A50965
Numbers k such that k![4] - 16 is prime, where k![4] = A007662(k) = quadruple factorial. A329166
T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254907