521057057 has 4 divisors (see below), whose sum is σ = 528834096. Its totient is φ = 513280020.

The previous prime is 521057041. The next prime is 521057071. The reversal of 521057057 is 750750125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521057057 - 2⁴ = 521057041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521057027) 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, 3888419 + ... + 3888552.

It is an arithmetic number, because the mean of its divisors is an integer number (132208524).

Almost surely, 2^521057057 is an apocalyptic number.

It is an amenable number.

521057057 is a deficient number, since it is larger than the sum of its proper divisors (7777039).

521057057 is an equidigital number, since it uses as much as digits as its factorization.

521057057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777038.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 521057057 is about 22826.6742430867. The cubic root of 521057057 is about 804.6896721872.

The spelling of 521057057 in words is "five hundred twenty-one million, fifty-seven thousand, fifty-seven".