Properties of the Number 61969

Sixty-One Thousand Nine Hundred Sixty-Nine

Basics

Value: 61968 → 61969 → 61970

Parity: odd

Prime: No

Previous Prime: 61967

Next Prime: 61979

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 31 × 1999

Divisors: 1, 31, 1999, 61969

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111001000010001

Octal: 171021

Duodecimal: 2BA41

Hexadecimal: f211

Square: 3840156961

Square Root: 248.93573467865156

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

a(n) = n-th multiple of n with digit sum n. A82260

Expansion of 1/(1 - x - x³ - x⁵ - x⁷). A117760

Number of (w,x,y,z) with all terms in {1,...,n} and w·x-y·z<=n. A212109

a(0) = 1; a(n) = ∑_{k=0..floor((n-1)/4)} binomial(n,4·k+1) * a(k). A352904

G.f. A(x) satisfies 1/x = ∑_n=-oo..+oo A(x)^2·n * (A(x)ⁿ + 2)^2·n+1. A378572

Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 16 (most significant digit on right). A61969