Properties of the Number 81281

Eighty-One Thousand Two Hundred Eighty-One

Basics

Value: 81280 → 81281 → 81282

Parity: odd

Prime: Yes

Previous Prime: 81239

Next Prime: 81283

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 81281

Divisors: 1, 81281

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110110000001

Octal: 236601

Duodecimal: 3B055

Hexadecimal: 13d81

Square: 6606600961

Square Root: 285.0982286861846

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

Twice-partitioned numbers where the first partition is strict and the latter partitions are constant. A279786

Prime factors of generalized Fermat numbers of the form 12^{2^m} + 1 with m >= 0. A273950

Primes which can be expressed as sum of distinct powers of 5. A77719

Irregular triangle read by rows: row n lists the distinct prime factors of the generalized Fermat number F_n(12) = 12^2ⁿ + 1. A392905

Primes having only {1, 2, 8} as digits. A385775

Sums of 5 distinct powers of 5. A38477

Primes whose base-5 representation also is the base-2 representation of a prime. A235462

Decimal part of a(n)^1/3 starts with a 'nine digits' anagram. A34278

Numbers whose anti-divisors sum to a perfect cube. A109351

Primes p such that p+2, n*(p+2)+6 and p*(p+2)+8 are also prime. A130735