521511252 has 24 divisors (see below), whose sum is σ = 1217531616. Its totient is φ = 173741088.

The previous prime is 521511251. The next prime is 521511271. The reversal of 521511252 is 252115125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521511251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12663 + ... + 34689.

It is an arithmetic number, because the mean of its divisors is an integer number (50730484).

Almost surely, 2^521511252 is an apocalyptic number.

It is an amenable number.

521511252 is an abundant number, since it is smaller than the sum of its proper divisors (696020364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521511252 is a wasteful number, since it uses less digits than its factorization.

521511252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24007 (or 24005 counting only the distinct ones).

The product of its digits is 1000, while the sum is 24.

The square root of 521511252 is about 22836.6208533574. The cubic root of 521511252 is about 804.9234149072.

Adding to 521511252 its reverse (252115125), we get a palindrome (773626377).

The spelling of 521511252 in words is "five hundred twenty-one million, five hundred eleven thousand, two hundred fifty-two".