252231521 has 4 divisors (see below), whose sum is σ = 253924500. Its totient is φ = 250538544.

The previous prime is 252231503. The next prime is 252231557. The reversal of 252231521 is 125132252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32035600 + 220195921 = 5660^2 + 14839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252231521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252230521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 846266 + ... + 846563.

It is an arithmetic number, because the mean of its divisors is an integer number (63481125).

Almost surely, 2^252231521 is an apocalyptic number.

It is an amenable number.

252231521 is a deficient number, since it is larger than the sum of its proper divisors (1692979).

252231521 is a wasteful number, since it uses less digits than its factorization.

252231521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692978.

The product of its digits is 1200, while the sum is 23.

The square root of 252231521 is about 15881.7984183152. The cubic root of 252231521 is about 631.8293357280.

Adding to 252231521 its reverse (125132252), we get a palindrome (377363773).

It can be divided in two parts, 2522 and 31521, that added together give a palindrome (34043).

The spelling of 252231521 in words is "two hundred fifty-two million, two hundred thirty-one thousand, five hundred twenty-one".