325491813 has 12 divisors (see below), whose sum is σ = 470430220. Its totient is φ = 216867456.

The previous prime is 325491799. The next prime is 325491821. The reversal of 325491813 is 318194523.

325491813 is a `hidden beast` number, since 32 + 549 + 1 + 81 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23357889 + 302133924 = 4833^2 + 17382^2 .

It is not a de Polignac number, because 325491813 - 2⁴ = 325491797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (325491863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7203 + ... + 26511.

Almost surely, 2^325491813 is an apocalyptic number.

It is an amenable number.

325491813 is a deficient number, since it is larger than the sum of its proper divisors (144938407).

325491813 is a wasteful number, since it uses less digits than its factorization.

325491813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21188 (or 21185 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 325491813 is about 18041.3916591819. The cubic root of 325491813 is about 687.8810673326.

The spelling of 325491813 in words is "three hundred twenty-five million, four hundred ninety-one thousand, eight hundred thirteen".