520920791 has 4 divisors (see below), whose sum is σ = 533035272. Its totient is φ = 508806312.

The previous prime is 520920761. The next prime is 520920797. The reversal of 520920791 is 197029025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520920791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520920797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6057176 + ... + 6057261.

It is an arithmetic number, because the mean of its divisors is an integer number (133258818).

Almost surely, 2^520920791 is an apocalyptic number.

520920791 is a deficient number, since it is larger than the sum of its proper divisors (12114481).

520920791 is a wasteful number, since it uses less digits than its factorization.

520920791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12114480.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 520920791 is about 22823.6892504258. The cubic root of 520920791 is about 804.6195190236.

The spelling of 520920791 in words is "five hundred twenty million, nine hundred twenty thousand, seven hundred ninety-one".