813988325 has 24 divisors (see below), whose sum is σ = 1026271368. Its totient is φ = 640327680.

The previous prime is 813988319. The next prime is 813988333. The reversal of 813988325 is 523889318.

It can be written as a sum of positive squares in 12 ways, for example, as 132204004 + 681784321 = 11498^2 + 26111^2 .

It is not a de Polignac number, because 813988325 - 2¹⁴ = 813971941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 813988325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1052639 + ... + 1053411.

It is an arithmetic number, because the mean of its divisors is an integer number (42761307).

Almost surely, 2^813988325 is an apocalyptic number.

It is an amenable number.

813988325 is a deficient number, since it is larger than the sum of its proper divisors (212283043).

813988325 is a wasteful number, since it uses less digits than its factorization.

813988325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1428 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 813988325 is about 28530.4806303714. The cubic root of 813988325 is about 933.6972047063.

The spelling of 813988325 in words is "eight hundred thirteen million, nine hundred eighty-eight thousand, three hundred twenty-five".