521171057 has 16 divisors (see below), whose sum is σ = 604340352. Its totient is φ = 444184320.

The previous prime is 521171003. The next prime is 521171081. The reversal of 521171057 is 750171125.

It is a cyclic number.

It is not a de Polignac number, because 521171057 - 2⁸ = 521170801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521173057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43883 + ... + 54479.

It is an arithmetic number, because the mean of its divisors is an integer number (37771272).

Almost surely, 2^521171057 is an apocalyptic number.

It is an amenable number.

521171057 is a deficient number, since it is larger than the sum of its proper divisors (83169295).

521171057 is a wasteful number, since it uses less digits than its factorization.

521171057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10888.

The product of its (nonzero) digits is 2450, while the sum is 29.

The square root of 521171057 is about 22829.1711851307. The cubic root of 521171057 is about 804.7483528583.

The spelling of 521171057 in words is "five hundred twenty-one million, one hundred seventy-one thousand, fifty-seven".