258491531 has 2 divisors, whose sum is σ = 258491532. Its totient is φ = 258491530.

The previous prime is 258491507. The next prime is 258491537. The reversal of 258491531 is 135194852.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258491531 is a prime.

It is a super-2 number, since 2×258491531² = 133635743197447922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (258491537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129245765 + 129245766.

It is an arithmetic number, because the mean of its divisors is an integer number (129245766).

Almost surely, 2^258491531 is an apocalyptic number.

258491531 is a deficient number, since it is larger than the sum of its proper divisors (1).

258491531 is an equidigital number, since it uses as much as digits as its factorization.

258491531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 258491531 is about 16077.6718152847. The cubic root of 258491531 is about 637.0137004398.

The spelling of 258491531 in words is "two hundred fifty-eight million, four hundred ninety-one thousand, five hundred thirty-one".