Properties of the Number 81929

Eighty-One Thousand Nine Hundred Twenty-Nine

Basics

Value: 81928 → 81929 → 81930

Parity: odd

Prime: Yes

Previous Prime: 81919

Next Prime: 81931

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 81929

Divisors: 1, 81929

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10100000000001001

Octal: 240011

Duodecimal: 3B4B5

Hexadecimal: 14009

Square: 6712361041

Square Root: 286.23242304113626

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

Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d=2,4 or 6) and forming d-pattern=[2, 6,6]; short d-string notation of pattern = [266]. A78849

Primes p such that p+2, 2p+1, and 2p+3 are also prime. A69142

Number of partitions p of n such that (number of distinct parts of p) < max(p) - min(p). A239954

Lower twin primes with lower twin prime index. A88460

Primes whose consecutive digits differ by 7 or 8. A48419

Primes that can be formed by concatenating 2^a and 3^b. A68801

Initial member of four twin prime pairs with gap 210 between them. A261701

Smallest prime larger than 2ⁿ whose digits begin with those of 2ⁿ. A68842

Let p run through the primes; write p in base 10 and then interpret it in base 128 getting a number q; if q is prime then adjoin q to the sequence. A90718

Primes of the form 5n² + 9. A201487