252002521 has 4 divisors (see below), whose sum is σ = 254834100. Its totient is φ = 249170944.

The previous prime is 252002507. The next prime is 252002537. The reversal of 252002521 is 125200252.

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 100220121 + 151782400 = 10011^2 + 12320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252002521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252002551) 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, 1415656 + ... + 1415833.

It is an arithmetic number, because the mean of its divisors is an integer number (63708525).

Almost surely, 2^252002521 is an apocalyptic number.

It is an amenable number.

252002521 is a deficient number, since it is larger than the sum of its proper divisors (2831579).

252002521 is an equidigital number, since it uses as much as digits as its factorization.

252002521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831578.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 252002521 is about 15874.5872702253. The cubic root of 252002521 is about 631.6380660473.

Adding to 252002521 its reverse (125200252), we get a palindrome (377202773).

The spelling of 252002521 in words is "two hundred fifty-two million, two thousand, five hundred twenty-one".