258491009 has 4 divisors (see below), whose sum is σ = 295418304. Its totient is φ = 221563716.

The previous prime is 258490979. The next prime is 258491047. The reversal of 258491009 is 900194852.

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 258491009 - 2¹² = 258486913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258491209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18463637 + ... + 18463650.

It is an arithmetic number, because the mean of its divisors is an integer number (73854576).

Almost surely, 2^258491009 is an apocalyptic number.

It is an amenable number.

258491009 is a deficient number, since it is larger than the sum of its proper divisors (36927295).

258491009 is an equidigital number, since it uses as much as digits as its factorization.

258491009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36927294.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 258491009 is about 16077.6555815828. The cubic root of 258491009 is about 637.0132716426.

The spelling of 258491009 in words is "two hundred fifty-eight million, four hundred ninety-one thousand, nine".