Properties of the Number 15181

Fifteen Thousand One Hundred Eighty-One

Basics

Value: 15180 → 15181 → 15182

Parity: odd

Prime: No

Previous Prime: 15173

Next Prime: 15187

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 17 × 19 × 47

Divisors: 1, 17, 19, 47, 323, 799, 893, 15181

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11101101001101

Octal: 35515

Duodecimal: 8951

Hexadecimal: 3b4d

Square: 230462761

Square Root: 123.21120078953861

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 occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2. A221388

29-gonal numbers: a(n) = n*(27·n-25)/2. A255187

a(n) = (3 + 2·n + 6·n² + 4·n³)/3. A166464

Number of distinct values taken by the entropy for permutations of [1..n], where the entropy of a permutation π is ∑_k=1..n (π(k)-k)². A126972

First number in the n-th row of A172002. A168388

a(n) = 8·n² - 7·n + 1. A125201

Squarefree composite numbers n such that bⁿ == b (mod gpf(n)) for every integer b, where gpf(n) = A006530(n). A276832

a(n) = ∑_{1 <= x₁, x₂, x₃, x₄ <= n} gcd(x₁, x₂, x₃, x₄, n)⁵. A372937

Pseudoprimes to base 69. A20197

Pseudoprimes to base 84. A20212