Properties of the Number 81172

Eighty-One Thousand One Hundred Seventy-Two

Basics

Value: 81171 → 81172 → 81173

Parity: even

Prime: No

Previous Prime: 81163

Next Prime: 81173

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 7 × 13 × 223

Divisors: 1, 2, 4, 7, 13, 14, 26, 28, 52, 91

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110100010100

Octal: 236424

Duodecimal: 3AB84

Hexadecimal: 13d14

Square: 6588893584

Square Root: 284.9070023709491

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) = ∑_k=0..n-1 9^k*B(k)*binomial(n,k) where B(k) is the k-th Bernoulli number. A83013

Numerator of Bernoulli(n, 1/9). A158807

Sum of divisors of n and product of divisors of n are both perfect cubes. A244428

Let·be the sum of the divisors d_i of k such that d_i | σ(k). Sequence lists the numbers k for which x³ = σ(k). A284284

Number of dyslexic rooted compound windmills with n nodes and leaves of 2 colors where any 2 submills extending from the same node are different. A32236

G.f. = φ⁶, where φ = g.f. for A028930. A328531

Tribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3), with a(0) = 1, a(1) = 1, a(2) = 0. A81172