258008561 has 4 divisors (see below), whose sum is σ = 259978224. Its totient is φ = 256038900.

The previous prime is 258008551. The next prime is 258008591. The reversal of 258008561 is 165800852.

It is a happy number.

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 not a de Polignac number, because 258008561 - 2⁶ = 258008497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258008551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984635 + ... + 984896.

It is an arithmetic number, because the mean of its divisors is an integer number (64994556).

Almost surely, 2^258008561 is an apocalyptic number.

It is an amenable number.

258008561 is a deficient number, since it is larger than the sum of its proper divisors (1969663).

258008561 is a wasteful number, since it uses less digits than its factorization.

258008561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969662.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 258008561 is about 16062.6448942881. The cubic root of 258008561 is about 636.6167173274.

The spelling of 258008561 in words is "two hundred fifty-eight million, eight thousand, five hundred sixty-one".