520960721 has 8 divisors (see below), whose sum is σ = 528259584. Its totient is φ = 513712800.

The previous prime is 520960709. The next prime is 520960729. The reversal of 520960721 is 127069025.

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

It is a cyclic number.

It is not a de Polignac number, because 520960721 - 2¹⁰ = 520959697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520960729) 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, 8096 + ... + 33278.

It is an arithmetic number, because the mean of its divisors is an integer number (66032448).

Almost surely, 2^520960721 is an apocalyptic number.

It is an amenable number.

520960721 is a deficient number, since it is larger than the sum of its proper divisors (7298863).

520960721 is a wasteful number, since it uses less digits than its factorization.

520960721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25471.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 520960721 is about 22824.5639826920. The cubic root of 520960721 is about 804.6400772588.

The spelling of 520960721 in words is "five hundred twenty million, nine hundred sixty thousand, seven hundred twenty-one".