258491899 has 4 divisors (see below), whose sum is σ = 258556536. Its totient is φ = 258427264.

The previous prime is 258491873. The next prime is 258491911. The reversal of 258491899 is 998194852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258491899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258491809) 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, 25894 + ... + 34459.

It is an arithmetic number, because the mean of its divisors is an integer number (64639134).

Almost surely, 2^258491899 is an apocalyptic number.

258491899 is a deficient number, since it is larger than the sum of its proper divisors (64637).

258491899 is an equidigital number, since it uses as much as digits as its factorization.

258491899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64636.

The product of its digits is 1866240, while the sum is 55.

The square root of 258491899 is about 16077.6832597237. The cubic root of 258491899 is about 637.0140027333.

The spelling of 258491899 in words is "two hundred fifty-eight million, four hundred ninety-one thousand, eight hundred ninety-nine".