520305431 has 2 divisors, whose sum is σ = 520305432. Its totient is φ = 520305430.

The previous prime is 520305391. The next prime is 520305479. The reversal of 520305431 is 134503025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520305431 - 2²⁶ = 453196567 is a prime.

It is a super-2 number, since 2×520305431² = 541435483056191522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 520305397 and 520305406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520305131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260152715 + 260152716.

It is an arithmetic number, because the mean of its divisors is an integer number (260152716).

Almost surely, 2^520305431 is an apocalyptic number.

520305431 is a deficient number, since it is larger than the sum of its proper divisors (1).

520305431 is an equidigital number, since it uses as much as digits as its factorization.

520305431 is an evil number, because the sum of its binary digits is even.

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

The square root of 520305431 is about 22810.2045365665. The cubic root of 520305431 is about 804.3025637599.

Adding to 520305431 its reverse (134503025), we get a palindrome (654808456).

The spelling of 520305431 in words is "five hundred twenty million, three hundred five thousand, four hundred thirty-one".