Properties of the Number 81237

Eighty-One Thousand Two Hundred Thirty-Seven

Basics

Value: 81236 → 81237 → 81238

Parity: odd

Prime: No

Previous Prime: 81233

Next Prime: 81239

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 2083

Divisors: 1, 3, 13, 39, 2083, 6249, 27079, 81237

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 10011110101010101

Octal: 236525

Duodecimal: 3B019

Hexadecimal: 13d55

Square: 6599450169

Square Root: 285.0210518540692

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

Least k such that n <= ∑_i=1..k 1/A258252(i), where A258252 are the numbers having lowest possible denominators for the sums of reciprocals. A258255

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation. A146877

a(n) = (a(n-1) + n)/2^k where 2^k is the largest power of 2 dividing a(n-1) + n, for n>1 with a(1)=1. A208884

Numbers n with no k, 0<k<n, such that μ(n-k)=μ(n)=μ(n+k), where μ=A008683 (Moebius function). A81237