520950991 has 8 divisors (see below), whose sum is σ = 568684368. Its totient is φ = 473280000.

The previous prime is 520950931. The next prime is 520951021. The reversal of 520950991 is 199059025.

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 520950991 - 2⁷ = 520950863 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 (520950901) 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, 2821 + ... + 32401.

It is an arithmetic number, because the mean of its divisors is an integer number (71085546).

Almost surely, 2^520950991 is an apocalyptic number.

520950991 is a deficient number, since it is larger than the sum of its proper divisors (47733377).

520950991 is a wasteful number, since it uses less digits than its factorization.

520950991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31193.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 520950991 is about 22824.3508341420. The cubic root of 520950991 is about 804.6350677982.

The spelling of 520950991 in words is "five hundred twenty million, nine hundred fifty thousand, nine hundred ninety-one".