252447621 has 4 divisors (see below), whose sum is σ = 336596832. Its totient is φ = 168298412.

The previous prime is 252447617. The next prime is 252447631. The reversal of 252447621 is 126744252.

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 252447621 - 2² = 252447617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252447631) 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, 42074601 + ... + 42074606.

It is an arithmetic number, because the mean of its divisors is an integer number (84149208).

Almost surely, 2^252447621 is an apocalyptic number.

It is an amenable number.

252447621 is a deficient number, since it is larger than the sum of its proper divisors (84149211).

252447621 is an equidigital number, since it uses as much as digits as its factorization.

252447621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84149210.

The product of its digits is 26880, while the sum is 33.

The square root of 252447621 is about 15888.6003474189. The cubic root of 252447621 is about 632.0097246875.

The spelling of 252447621 in words is "two hundred fifty-two million, four hundred forty-seven thousand, six hundred twenty-one".