252310921 has 2 divisors, whose sum is σ = 252310922. Its totient is φ = 252310920.

The previous prime is 252310909. The next prime is 252310939. The reversal of 252310921 is 129013252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 251571321 + 739600 = 15861^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 252310921 - 2¹⁷ = 252179849 is a prime.

It is not a weakly prime, because it can be changed into another prime (252310901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126155460 + 126155461.

It is an arithmetic number, because the mean of its divisors is an integer number (126155461).

Almost surely, 2^252310921 is an apocalyptic number.

It is an amenable number.

252310921 is a deficient number, since it is larger than the sum of its proper divisors (1).

252310921 is an equidigital number, since it uses as much as digits as its factorization.

252310921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 252310921 is about 15884.2979385304. The cubic root of 252310921 is about 631.8956266578.

The spelling of 252310921 in words is "two hundred fifty-two million, three hundred ten thousand, nine hundred twenty-one".