26431291 has 2 divisors, whose sum is σ = 26431292. Its totient is φ = 26431290.

The previous prime is 26431289. The next prime is 26431297. The reversal of 26431291 is 19213462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26431291 - 2¹ = 26431289 is a prime.

It is a super-2 number, since 2×26431291² = 1397226287853362, which contains 22 as substring.

Together with 26431289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26431297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215645 + 13215646.

It is an arithmetic number, because the mean of its divisors is an integer number (13215646).

Almost surely, 2^26431291 is an apocalyptic number.

26431291 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431291 is an equidigital number, since it uses as much as digits as its factorization.

26431291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 26431291 is about 5141.1371310246. The cubic root of 26431291 is about 297.8787060983.

The spelling of 26431291 in words is "twenty-six million, four hundred thirty-one thousand, two hundred ninety-one".