Properties of the Number 81439

Eighty-One Thousand Four Hundred Thirty-Nine

Basics

Value: 81438 → 81439 → 81440

Parity: odd

Prime: Yes

Previous Prime: 81421

Next Prime: 81457

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 81439

Divisors: 1, 81439

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011111000011111

Octal: 237037

Duodecimal: 3B167

Hexadecimal: 13e1f

Square: 6632310721

Square Root: 285.37519163375083

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

Prime numbers p that yield a new record for the least number k such that p·k + 1 and p·k - 1 are twin primes. A220141

Balanced primes separated from the next lower and next higher prime neighbors by 18. A53073

Numbers n that yield a new record for k such that n·k+1 and n·k-1 are twin primes. A220143

Where records occur in A124522. A124743

Expansion of exp(2·x)*cosh(x/sqrt(1 - x²)). A81439