521057 has 4 divisors (see below), whose sum is σ = 522900. Its totient is φ = 519216.

The previous prime is 521051. The next prime is 521063. The reversal of 521057 is 750125.

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

It is an interprime number because it is at equal distance from previous prime (521051) and next prime (521063).

It can be written as a sum of positive squares in 2 ways, for example, as 421201 + 99856 = 649^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 521057 - 2⁴ = 521041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521051) 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, 398 + ... + 1095.

It is an arithmetic number, because the mean of its divisors is an integer number (130725).

2⁵²¹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

521057 is a deficient number, since it is larger than the sum of its proper divisors (1843).

521057 is a wasteful number, since it uses less digits than its factorization.

521057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 521057 is about 721.8427806663. The cubic root of 521057 is about 80.4689642845.

The spelling of 521057 in words is "five hundred twenty-one thousand, fifty-seven".