Properties of the Number 15981

Fifteen Thousand Nine Hundred Eighty-One

Basics

Value: 15980 → 15981 → 15982

Parity: odd

Prime: No

Previous Prime: 15973

Next Prime: 15991

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 761

Divisors: 1, 3, 7, 21, 761, 2283, 5327, 15981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11111001101101

Octal: 37155

Duodecimal: 92B9

Hexadecimal: 3e6d

Square: 255392361

Square Root: 126.41598000252975

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 3·n binary matrices without unit columns up to row and column permutations. A57524

Hyper-Wiener index of a benzenoid consisting of a zig-zag chain of n hexagons (s=13; see the Gutman et al. reference). A193394

4-dimensional centered tetrahedral numbers. A8498

Triangle of coefficients of polynomials u(n,x) jointly generated with A209142; see the Formula section. A209141

Triangle of coefficients of polynomials u(n,x) jointly generated with A209746; see the Formula section. A209745

Number of inequivalent n-state 1-input n-output automata. A54748

Number of partitions of n into 6 parts such that every i-th smallest part (counted with multiplicity) is different from i. A244242

a(n) = ∑_k=0..n binomial(4·n+k,n). A391542

a(0) = 1, a(n) = 19·n² + 2 for n>0. A10009

The consecutive squares of numbers multiplied by their next consecutive integer. A193608