521533157 has 6 divisors (see below), whose sum is σ = 554016498. Its totient is φ = 490854464.

The previous prime is 521533141. The next prime is 521533169. The reversal of 521533157 is 751335125.

It can be written as a sum of positive squares in 3 ways, for example, as 52983841 + 468549316 = 7279^2 + 21646^2 .

It is not a de Polignac number, because 521533157 - 2⁴ = 521533141 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 (521533357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 902018 + ... + 902595.

It is an arithmetic number, because the mean of its divisors is an integer number (92336083).

Almost surely, 2^521533157 is an apocalyptic number.

It is an amenable number.

521533157 is a deficient number, since it is larger than the sum of its proper divisors (32483341).

521533157 is a wasteful number, since it uses less digits than its factorization.

521533157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804647 (or 1804630 counting only the distinct ones).

The product of its digits is 15750, while the sum is 32.

The square root of 521533157 is about 22837.1004508015. The cubic root of 521533157 is about 804.9346844631.

The spelling of 521533157 in words is "five hundred twenty-one million, five hundred thirty-three thousand, one hundred fifty-seven".