520249357 has 4 divisors (see below), whose sum is σ = 538189020. Its totient is φ = 502309696.

The previous prime is 520249309. The next prime is 520249421. The reversal of 520249357 is 753942025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 364848201 + 155401156 = 19101^2 + 12466^2 .

It is not a de Polignac number, because 520249357 - 2²³ = 511860749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520249307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8969788 + ... + 8969845.

It is an arithmetic number, because the mean of its divisors is an integer number (134547255).

Almost surely, 2^520249357 is an apocalyptic number.

It is an amenable number.

520249357 is a deficient number, since it is larger than the sum of its proper divisors (17939663).

520249357 is a wasteful number, since it uses less digits than its factorization.

520249357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17939662.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 520249357 is about 22808.9753605900. The cubic root of 520249357 is about 804.2736691404.

The spelling of 520249357 in words is "five hundred twenty million, two hundred forty-nine thousand, three hundred fifty-seven".