Properties of the Number 81375

Eighty-One Thousand Three Hundred Seventy-Five

Basics

Value: 81374 → 81375 → 81376

Parity: odd

Prime: No

Previous Prime: 81373

Next Prime: 81401

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 ³ × 7 × 31

Divisors: 1, 3, 5, 7, 15, 21, 25, 31, 35, 75

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110111011111

Octal: 236737

Duodecimal: 3B113

Hexadecimal: 13ddf

Square: 6621890625

Square Root: 285.26303651191824

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) = (1/12)*(n+5)*(n+1)*n². A14205

a(n) = n*(n+1)*(6·n-5)/2. A172082

a(n) = A276086(n)*A276086(σ(n)-n) - A276086(σ(n)), where A276086 is the primorial base exp-function, and σ is the sum of divisors function. A388281

a(n) = n*(2·n + 1)*(4·n + 1)/3. A258582

Odd square pyramidal numbers. A15221

Binomial(prime(n),s)/prime(n) where s is the sum of the decimal digits of n. A176266

a(n) is the smallest square pyramidal number with binary weight n. A359318

Multiplicities of 4-class association schemes. A326893

a(n) is the least number k such that A081373(k) = n. A81375

Numbers k such that 65537·2^k+1 is prime. A112245