521531252 has 24 divisors (see below), whose sum is σ = 996229920. Its totient is φ = 236921760.

The previous prime is 521531251. The next prime is 521531327. The reversal of 521531252 is 252135125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521531251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141578 + ... + 145214.

It is an arithmetic number, because the mean of its divisors is an integer number (41509580).

Almost surely, 2^521531252 is an apocalyptic number.

It is an amenable number.

521531252 is a deficient number, since it is larger than the sum of its proper divisors (474698668).

521531252 is a wasteful number, since it uses less digits than its factorization.

521531252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911 (or 6909 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 521531252 is about 22837.0587423162. The cubic root of 521531252 is about 804.9337044024.

Adding to 521531252 its reverse (252135125), we get a palindrome (773666377).

The spelling of 521531252 in words is "five hundred twenty-one million, five hundred thirty-one thousand, two hundred fifty-two".