813983525 has 12 divisors (see below), whose sum is σ = 1013535204. Its totient is φ = 648480000.

The previous prime is 813983497. The next prime is 813983539. The reversal of 813983525 is 525389318.

It can be written as a sum of positive squares in 6 ways, for example, as 93973636 + 720009889 = 9694^2 + 26833^2 .

It is not a de Polignac number, because 813983525 - 2²⁰ = 812934949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61526 + ... + 73575.

It is an arithmetic number, because the mean of its divisors is an integer number (84461267).

Almost surely, 2^813983525 is an apocalyptic number.

It is an amenable number.

813983525 is a deficient number, since it is larger than the sum of its proper divisors (199551679).

813983525 is a wasteful number, since it uses less digits than its factorization.

813983525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135352 (or 135347 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 813983525 is about 28530.3965096877. The cubic root of 813983525 is about 933.6953693994.

The spelling of 813983525 in words is "eight hundred thirteen million, nine hundred eighty-three thousand, five hundred twenty-five".