520969521 has 8 divisors (see below), whose sum is σ = 695075584. Its totient is φ = 347088240.

The previous prime is 520969517. The next prime is 520969541. The reversal of 520969521 is 125969025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520969521 - 2² = 520969517 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 520969521.

It is not an unprimeable number, because it can be changed into a prime (520969541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50710 + ... + 60111.

It is an arithmetic number, because the mean of its divisors is an integer number (86884448).

Almost surely, 2^520969521 is an apocalyptic number.

It is an amenable number.

520969521 is a deficient number, since it is larger than the sum of its proper divisors (174106063).

520969521 is a wasteful number, since it uses less digits than its factorization.

520969521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112391.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 520969521 is about 22824.7567566447. The cubic root of 520969521 is about 804.6446078581.

The spelling of 520969521 in words is "five hundred twenty million, nine hundred sixty-nine thousand, five hundred twenty-one".