258631 has 2 divisors, whose sum is σ = 258632. Its totient is φ = 258630.

The previous prime is 258623. The next prime is 258637. The reversal of 258631 is 136852.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 258631 - 2³ = 258623 is a prime.

It is a super-2 number, since 2×258631² = 133779988322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 258596 and 258605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129315 + 129316.

It is an arithmetic number, because the mean of its divisors is an integer number (129316).

2²⁵⁸⁶³¹ is an apocalyptic number.

258631 is a deficient number, since it is larger than the sum of its proper divisors (1).

258631 is an equidigital number, since it uses as much as digits as its factorization.

258631 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 258631 is about 508.5577646640. The cubic root of 258631 is about 63.7128246668.

The spelling of 258631 in words is "two hundred fifty-eight thousand, six hundred thirty-one".