252270721 has 4 divisors (see below), whose sum is σ = 252313600. Its totient is φ = 252227844.

The previous prime is 252270719. The next prime is 252270727. The reversal of 252270721 is 127072252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 252270721 - 2¹ = 252270719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252270721.

It is not an unprimeable number, because it can be changed into a prime (252270727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10881 + ... + 24958.

It is an arithmetic number, because the mean of its divisors is an integer number (63078400).

Almost surely, 2^252270721 is an apocalyptic number.

It is an amenable number.

252270721 is a deficient number, since it is larger than the sum of its proper divisors (42879).

252270721 is an equidigital number, since it uses as much as digits as its factorization.

252270721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42878.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 252270721 is about 15883.0324875321. The cubic root of 252270721 is about 631.8620654822.

The spelling of 252270721 in words is "two hundred fifty-two million, two hundred seventy thousand, seven hundred twenty-one".