521715612 has 24 divisors (see below), whose sum is σ = 1328003712. Its totient is φ = 158095600.

The previous prime is 521715569. The next prime is 521715631. The reversal of 521715612 is 216517125.

It is a self number, because there is not a number n which added to its sum of digits gives 521715612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1976064 + ... + 1976327.

It is an arithmetic number, because the mean of its divisors is an integer number (55333488).

Almost surely, 2^521715612 is an apocalyptic number.

It is an amenable number.

521715612 is an abundant number, since it is smaller than the sum of its proper divisors (806288100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521715612 is a wasteful number, since it uses less digits than its factorization.

521715612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952409 (or 3952407 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 521715612 is about 22841.0948073861. The cubic root of 521715612 is about 805.0285405824.

The spelling of 521715612 in words is "five hundred twenty-one million, seven hundred fifteen thousand, six hundred twelve".