Properties of the Number 26981

Twenty-Six Thousand Nine Hundred Eighty-One

Basics

Value: 26980 → 26981 → 26982

Parity: odd

Prime: Yes

Previous Prime: 26959

Next Prime: 26987

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 26981

Divisors: 1, 26981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110100101100101

Octal: 64545

Duodecimal: 13745

Hexadecimal: 6965

Square: 727974361

Square Root: 164.2589419179364

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

Number of tertiary alcohols (alkanols or alkyl alcohols C_n H_2n+1 OH) with n carbon atoms. A600

Numbers k such that k² and k³ have the same set of digits. A29797

Number of partitions of n into parts not of the form 13k, 13k+5 or 13k-5. Also number of partitions with at most 4 parts of size 1 and differences between parts at distance 5 are greater than 1. A35953

Primes p such that (p¹²⁸ + 1)/2 is prime. A341230

Primes p such that none of p-2, p-1, p+1, and p+2 is squarefree. A153215

Primes of the form ∑_k=1..m (m^k mod (m+k)). A156557

Prime numbers that are the sum of the first k lucky numbers, A046279(k), for some k. A46281

Number of zero-sum -n..n arrays of 4 elements with adjacent element differences also in -n..n. A202254

Primes of the form 2·n²+38·n+17. A243890

Primes p such that |100-p|, |1000-p|, |10000-p| and |100000-p| are also primes. A126021