521540252 has 12 divisors (see below), whose sum is σ = 913538136. Its totient is φ = 260529360.

The previous prime is 521540221. The next prime is 521540269. The reversal of 521540252 is 252045125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55274 + ... + 64017.

It is an arithmetic number, because the mean of its divisors is an integer number (76128178).

Almost surely, 2^521540252 is an apocalyptic number.

It is an amenable number.

521540252 is a deficient number, since it is larger than the sum of its proper divisors (391997884).

521540252 is a wasteful number, since it uses less digits than its factorization.

521540252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120388 (or 120386 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 521540252 is about 22837.2557896083. The cubic root of 521540252 is about 804.9383345894.

Adding to 521540252 its reverse (252045125), we get a palindrome (773585377).

The spelling of 521540252 in words is "five hundred twenty-one million, five hundred forty thousand, two hundred fifty-two".