520994761 has 4 divisors (see below), whose sum is σ = 595422592. Its totient is φ = 446566932.

The previous prime is 520994759. The next prime is 520994779. The reversal of 520994761 is 167499025.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 520994761 - 2¹ = 520994759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520994731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37213905 + ... + 37213918.

It is an arithmetic number, because the mean of its divisors is an integer number (148855648).

Almost surely, 2^520994761 is an apocalyptic number.

It is an amenable number.

520994761 is a deficient number, since it is larger than the sum of its proper divisors (74427831).

520994761 is an equidigital number, since it uses as much as digits as its factorization.

520994761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74427830.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 520994761 is about 22825.3096583595. The cubic root of 520994761 is about 804.6576021576.

The spelling of 520994761 in words is "five hundred twenty million, nine hundred ninety-four thousand, seven hundred sixty-one".