521139748 has 12 divisors (see below), whose sum is σ = 914103820. Its totient is φ = 259967232.

The previous prime is 521139719. The next prime is 521139757. The reversal of 521139748 is 847931125.

It can be written as a sum of positive squares in 2 ways, for example, as 103673124 + 417466624 = 10182^2 + 20432^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 521139748.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148713 + ... + 152176.

Almost surely, 2^521139748 is an apocalyptic number.

It is an amenable number.

521139748 is a deficient number, since it is larger than the sum of its proper divisors (392964072).

521139748 is a wasteful number, since it uses less digits than its factorization.

521139748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301326 (or 301324 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 521139748 is about 22828.4854512953. The cubic root of 521139748 is about 804.7322376306.

The spelling of 521139748 in words is "five hundred twenty-one million, one hundred thirty-nine thousand, seven hundred forty-eight".