258385531 has 2 divisors, whose sum is σ = 258385532. Its totient is φ = 258385530.

The previous prime is 258385513. The next prime is 258385559. The reversal of 258385531 is 135583852.

It is a happy number.

Together with previous prime (258385513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 258385531 - 2²⁵ = 224831099 is a prime.

It is a super-2 number, since 2×258385531² = 133526165260303922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (258380531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129192765 + 129192766.

It is an arithmetic number, because the mean of its divisors is an integer number (129192766).

Almost surely, 2^258385531 is an apocalyptic number.

258385531 is a deficient number, since it is larger than the sum of its proper divisors (1).

258385531 is an equidigital number, since it uses as much as digits as its factorization.

258385531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144000, while the sum is 40.

The square root of 258385531 is about 16074.3749800731. The cubic root of 258385531 is about 636.9266148218.

The spelling of 258385531 in words is "two hundred fifty-eight million, three hundred eighty-five thousand, five hundred thirty-one".