Properties of the Number 81250

Eighty-One Thousand Two Hundred Fifty

Basics

Value: 81249 → 81250 → 81251

Parity: even

Prime: No

Previous Prime: 81239

Next Prime: 81281

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 ⁵ × 13

Divisors: 1, 2, 5, 10, 13, 25, 26, 50, 65, 125

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110101100010

Octal: 236542

Duodecimal: 3B02A

Hexadecimal: 13d62

Square: 6601562500

Square Root: 285.0438562747845

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

Numbers j that are the hypotenuse of exactly 16 distinct integer-sided right triangles, i.e., j² can be written as a sum of two squares in 16 ways. A97238

Sums of two powers of 5. A55237

Sums of two distinct powers of 5. A38474

a(n) = ceiling(log(n)*2ⁿ/n). A65615

Triangle S(n,k) by rows: coefficients of 5^(n-1/2)*(x^1/5*d/dx)ⁿ when n is odd, and of 5^n/2*(x^4/5*d/dx)ⁿ when n is even. A223171

Numbers k that are a substring of k*(k-1). A316263

Primitive integers for the number of ways k to write as a sum of two squares. A336542

Consecutive states of the linear congruential pseudo-random number generator (3661·s + 30809) mod 145800 when started at s=1. A385365

Expansion of f(-x², -x¹⁰) / f(-x, -x) in powers of·where f(, ) is Ramanujan's general θ function. A262984

Number of nX2 0..1 arrays with no element equal to more than three of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A281159