Properties of the Number 81515

Eighty-One Thousand Five Hundred Fifteen

Basics

Value: 81514 → 81515 → 81516

Parity: odd

Prime: No

Previous Prime: 81509

Next Prime: 81517

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 7 × 17 × 137

Divisors: 1, 5, 7, 17, 35, 85, 119, 137, 595, 685

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001101011

Octal: 237153

Duodecimal: 3B20B

Hexadecimal: 13e6b

Square: 6644695225

Square Root: 285.50831861786446

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*(n+1)*(4·n+1)/2. A135713

[ (3rd elementary symmetric function of 3,4,...,n+4)/(3+4+...+n+4) ]. A24191

a(n) is the number of n-gons in A000940 that are asymmetric. A357602

Minimal value of A007947(m*(3ⁿ-m)) with m coprime to 3. A147801

Sum of terms in n-th row of A081517. A81515

Largest integer less than 12 and coprime to n. A231472