Properties of the Number 72130

Seventy-Two Thousand One Hundred Thirty

Basics

Value: 72129 → 72130 → 72131

Parity: even

Prime: No

Previous Prime: 72109

Next Prime: 72139

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 7213

Divisors: 1, 2, 5, 10, 7213, 14426, 36065, 72130

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001100111000010

Octal: 214702

Duodecimal: 358AA

Hexadecimal: 119c2

Square: 5202736900

Square Root: 268.5702887513807

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 k such that binomial(4k, k) + 1 is prime. A125241

a(n) = ∑_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is n-th diagonal sum of left-justified array T given by A027011. A27022

Number of (n+2) X 5 0..1 matrices with each 3 X 3 subblock idempotent. A224554

Square root of a(n) contains the n-th Fibonacci number as a string of digits to the immediate right of the decimal point (excluding leading zeros). A99401

a(n+1) - 3·a(n) + a(n-1) = (2/3)*(1+wⁿ⁺¹+w^2·n+2); a(1) = 0, a(2) = 1; where w is the cubic root of unity. A72130