521993012 has 12 divisors (see below), whose sum is σ = 914501280. Its totient is φ = 260706936.

The previous prime is 521993009. The next prime is 521993057. The reversal of 521993012 is 210399125.

It is a self number, because there is not a number n which added to its sum of digits gives 521993012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68312 + ... + 75567.

It is an arithmetic number, because the mean of its divisors is an integer number (76208440).

Almost surely, 2^521993012 is an apocalyptic number.

It is an amenable number.

521993012 is a deficient number, since it is larger than the sum of its proper divisors (392508268).

521993012 is a wasteful number, since it uses less digits than its factorization.

521993012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144790 (or 144788 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 521993012 is about 22847.1663888544. The cubic root of 521993012 is about 805.1711951528.

The spelling of 521993012 in words is "five hundred twenty-one million, nine hundred ninety-three thousand, twelve".