258031561 has 4 divisors (see below), whose sum is σ = 258090624. Its totient is φ = 257972500.

The previous prime is 258031547. The next prime is 258031577. The reversal of 258031561 is 165130852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258031561 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258031061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22405 + ... + 31906.

It is an arithmetic number, because the mean of its divisors is an integer number (64522656).

Almost surely, 2^258031561 is an apocalyptic number.

It is an amenable number.

258031561 is a deficient number, since it is larger than the sum of its proper divisors (59063).

258031561 is an equidigital number, since it uses as much as digits as its factorization.

258031561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59062.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 258031561 is about 16063.3608251823. The cubic root of 258031561 is about 636.6356336887.

The spelling of 258031561 in words is "two hundred fifty-eight million, thirty-one thousand, five hundred sixty-one".