Properties of the Number 51491

Fifty-One Thousand Four Hundred Ninety-One

Basics

Value: 51490 → 51491 → 51492

Parity: odd

Prime: No

Previous Prime: 51487

Next Prime: 51503

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 11 × 31 × 151

Divisors: 1, 11, 31, 151, 341, 1661, 4681, 51491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1100100100100011

Octal: 144443

Duodecimal: 2596B

Hexadecimal: c923

Square: 2651323081

Square Root: 226.9162841225812

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

T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 nXk array. A219627

A fourth-order linear divisibility sequence: a(n) = (2ⁿ + 1)*(2^3·n - 1)/ ( (2 + 1)*(2³ - 1) ). A238538

a(n) = sigma₂(n)*sigma₃(n)/σ(n). A320917

A027642(6·n+6)/(sequence of period 2:repeat 42,210). A216639

Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 3Xn array. A219629

Decimal expansion of Otter's rooted tree constant: lim_n->inf A000081(n+1)/A000081(n). A51491

A Calabi-Yau period integral: a(n) = C(4·n,2·n)*C(2·n,n)³. A307618