Properties of the Number 81049

Eighty-One Thousand Forty-Nine

Basics

Value: 81048 → 81049 → 81050

Parity: odd

Prime: Yes

Previous Prime: 81047

Next Prime: 81071

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 81049

Divisors: 1, 81049

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110010011001

Octal: 236231

Duodecimal: 3AAA1

Hexadecimal: 13c99

Square: 6568940401

Square Root: 284.6910606253733

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

Last term of prime quadruples. A90258

Primes obtained from other primes by prefixing an 8. A290407

Primes p such that p-+1, p-+3, p-+5 are not squarefree. A155145

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 0, 0), (1, 1, -1), (1, 1, 1)}. A149641

a(n) = n! - Stirling1(n+1, 2) where Stirling1 is A048994. A81049

Smallest k such that A073259(k)=n or 0 if there is no such value; the first number of which length of fixed-point-list terminated by k-th composite number equals n. A73323