521329939 has 16 divisors (see below), whose sum is σ = 595250208. Its totient is φ = 452316672.

The previous prime is 521329933. The next prime is 521329967. The reversal of 521329939 is 939923125.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521329939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521329895 and 521329904.

It is not an unprimeable number, because it can be changed into a prime (521329933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272424 + ... + 274330.

It is an arithmetic number, because the mean of its divisors is an integer number (37203138).

Almost surely, 2^521329939 is an apocalyptic number.

521329939 is a deficient number, since it is larger than the sum of its proper divisors (73920269).

521329939 is a wasteful number, since it uses less digits than its factorization.

521329939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174.

The product of its digits is 131220, while the sum is 43.

The square root of 521329939 is about 22832.6507221566. The cubic root of 521329939 is about 804.8301219405.

The spelling of 521329939 in words is "five hundred twenty-one million, three hundred twenty-nine thousand, nine hundred thirty-nine".