Properties of the Number 72139

Seventy-Two Thousand One Hundred Thirty-Nine

Basics

Value: 72138 → 72139 → 72140

Parity: odd

Prime: Yes

Previous Prime: 72109

Next Prime: 72161

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 72139

Divisors: 1, 72139

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10001100111001011

Octal: 214713

Duodecimal: 358B7

Hexadecimal: 119cb

Square: 5204035321

Square Root: 268.58704361901005

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

The sum of the numbers on straight lines of incrementing length n when drawn over numbers of the square spiral, where each line contains numbers which sum to the minimum possible value, and each number on the spiral can only be in one line. If two or more lines exist with the same sum the one containing the smallest number is chosen. A340974

a(n) is the numerator of the probability that the procedure described in A372422 successfully ends with the selection of a single person, starting with n persons. A372482

Last term of the preperiodic part of the 'Reverse and Subtract' trajectory of n, or -1 if the trajectory is completely periodic. A72139