520561831 has 2 divisors, whose sum is σ = 520561832. Its totient is φ = 520561830.

The previous prime is 520561819. The next prime is 520561891. The reversal of 520561831 is 138165025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520561831 - 2⁵ = 520561799 is a prime.

It is a super-2 number, since 2×520561831² = 541969239788145122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 520561793 and 520561802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520561891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260280915 + 260280916.

It is an arithmetic number, because the mean of its divisors is an integer number (260280916).

Almost surely, 2^520561831 is an apocalyptic number.

520561831 is a deficient number, since it is larger than the sum of its proper divisors (1).

520561831 is an equidigital number, since it uses as much as digits as its factorization.

520561831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 520561831 is about 22815.8241358931. The cubic root of 520561831 is about 804.4346588074.

The spelling of 520561831 in words is "five hundred twenty million, five hundred sixty-one thousand, eight hundred thirty-one".