258315809 has 2 divisors, whose sum is σ = 258315810. Its totient is φ = 258315808.

The previous prime is 258315803. The next prime is 258315817. The reversal of 258315809 is 908513852.

258315809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255520225 + 2795584 = 15985^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 258315809 - 2¹⁶ = 258250273 is a prime.

It is not a weakly prime, because it can be changed into another prime (258315803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129157904 + 129157905.

It is an arithmetic number, because the mean of its divisors is an integer number (129157905).

Almost surely, 2^258315809 is an apocalyptic number.

It is an amenable number.

258315809 is a deficient number, since it is larger than the sum of its proper divisors (1).

258315809 is an equidigital number, since it uses as much as digits as its factorization.

258315809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 258315809 is about 16072.2061024615. The cubic root of 258315809 is about 636.8693208599.

The spelling of 258315809 in words is "two hundred fifty-eight million, three hundred fifteen thousand, eight hundred nine".