520530431 has 2 divisors, whose sum is σ = 520530432. Its totient is φ = 520530430.

The previous prime is 520530407. The next prime is 520530443. The reversal of 520530431 is 134035025.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520530431 is a prime.

It is a super-2 number, since 2×520530431² = 541903859194091522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 520530397 and 520530406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520536431) 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 as a sum of consecutive naturals, namely, 260265215 + 260265216.

It is an arithmetic number, because the mean of its divisors is an integer number (260265216).

Almost surely, 2^520530431 is an apocalyptic number.

520530431 is a deficient number, since it is larger than the sum of its proper divisors (1).

520530431 is an equidigital number, since it uses as much as digits as its factorization.

520530431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 520530431 is about 22815.1360066075. The cubic root of 520530431 is about 804.4184841318.

Adding to 520530431 its reverse (134035025), we get a palindrome (654565456).

The spelling of 520530431 in words is "five hundred twenty million, five hundred thirty thousand, four hundred thirty-one".