252478621 has 4 divisors (see below), whose sum is σ = 252657472. Its totient is φ = 252299772.

The previous prime is 252478609. The next prime is 252478637. The reversal of 252478621 is 126874252.

It is a happy number.

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 252478621 - 2¹⁹ = 251954333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252478691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87291 + ... + 90136.

It is an arithmetic number, because the mean of its divisors is an integer number (63164368).

Almost surely, 2^252478621 is an apocalyptic number.

It is an amenable number.

252478621 is a deficient number, since it is larger than the sum of its proper divisors (178851).

252478621 is a wasteful number, since it uses less digits than its factorization.

252478621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178850.

The product of its digits is 53760, while the sum is 37.

The square root of 252478621 is about 15889.5758596635. The cubic root of 252478621 is about 632.0355934195.

The spelling of 252478621 in words is "two hundred fifty-two million, four hundred seventy-eight thousand, six hundred twenty-one".