258135391 has 2 divisors, whose sum is σ = 258135392. Its totient is φ = 258135390.

The previous prime is 258135323. The next prime is 258135401. The reversal of 258135391 is 193531852.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 258135391 - 2¹⁵ = 258102623 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 258135391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258135301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129067695 + 129067696.

It is an arithmetic number, because the mean of its divisors is an integer number (129067696).

Almost surely, 2^258135391 is an apocalyptic number.

258135391 is a deficient number, since it is larger than the sum of its proper divisors (1).

258135391 is an equidigital number, since it uses as much as digits as its factorization.

258135391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 258135391 is about 16066.5923891782. The cubic root of 258135391 is about 636.7210147344.

The spelling of 258135391 in words is "two hundred fifty-eight million, one hundred thirty-five thousand, three hundred ninety-one".