521542252 has 48 divisors (see below), whose sum is σ = 1204858368. Its totient is φ = 191243520.

The previous prime is 521542249. The next prime is 521542277. The reversal of 521542252 is 252245125.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 521542252.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44568 + ... + 55039.

It is an arithmetic number, because the mean of its divisors is an integer number (25101216).

Almost surely, 2^521542252 is an apocalyptic number.

It is an amenable number.

521542252 is an abundant number, since it is smaller than the sum of its proper divisors (683316116).

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

521542252 is a wasteful number, since it uses less digits than its factorization.

521542252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99646 (or 99644 counting only the distinct ones).

The product of its digits is 8000, while the sum is 28.

The square root of 521542252 is about 22837.2995776646. The cubic root of 521542252 is about 804.9393635126.

Adding to 521542252 its reverse (252245125), we get a palindrome (773787377).

The spelling of 521542252 in words is "five hundred twenty-one million, five hundred forty-two thousand, two hundred fifty-two".