520256431 has 4 divisors (see below), whose sum is σ = 520605000. Its totient is φ = 519907864.

The previous prime is 520256411. The next prime is 520256447. The reversal of 520256431 is 134652025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520256431 - 2²³ = 511867823 is a prime.

It is a super-2 number, since 2×520256431² = 541333507993715522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520256431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520256411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172036 + ... + 175033.

It is an arithmetic number, because the mean of its divisors is an integer number (130151250).

Almost surely, 2^520256431 is an apocalyptic number.

520256431 is a deficient number, since it is larger than the sum of its proper divisors (348569).

520256431 is a wasteful number, since it uses less digits than its factorization.

520256431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348568.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 520256431 is about 22809.1304305973. The cubic root of 520256431 is about 804.2773144476.

The spelling of 520256431 in words is "five hundred twenty million, two hundred fifty-six thousand, four hundred thirty-one".