521311138 has 16 divisors (see below), whose sum is σ = 796628160. Its totient is φ = 255784176.

The previous prime is 521311129. The next prime is 521311157. The reversal of 521311138 is 831113125.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68731 + ... + 75937.

It is an arithmetic number, because the mean of its divisors is an integer number (49789260).

Almost surely, 2^521311138 is an apocalyptic number.

521311138 is a deficient number, since it is larger than the sum of its proper divisors (275317022).

521311138 is a wasteful number, since it uses less digits than its factorization.

521311138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7881.

The product of its digits is 720, while the sum is 25.

The square root of 521311138 is about 22832.2390054064. The cubic root of 521311138 is about 804.8204468180.

The spelling of 521311138 in words is "five hundred twenty-one million, three hundred eleven thousand, one hundred thirty-eight".