265831 has 2 divisors, whose sum is σ = 265832. Its totient is φ = 265830.

The previous prime is 265819. The next prime is 265841. The reversal of 265831 is 138562.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265831 - 2⁷ = 265703 is a prime.

It is a super-2 number, since 2×265831² = 141332241122, which contains 22 as substring.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 265796 and 265805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132915 + 132916.

It is an arithmetic number, because the mean of its divisors is an integer number (132916).

2²⁶⁵⁸³¹ is an apocalyptic number.

265831 is a deficient number, since it is larger than the sum of its proper divisors (1).

265831 is an equidigital number, since it uses as much as digits as its factorization.

265831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 265831 is about 515.5880138250. The cubic root of 265831 is about 64.2986530100.

The spelling of 265831 in words is "two hundred sixty-five thousand, eight hundred thirty-one".