252175981 has 2 divisors, whose sum is σ = 252175982. Its totient is φ = 252175980.

The previous prime is 252175949. The next prime is 252175993. The reversal of 252175981 is 189571252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190302025 + 61873956 = 13795^2 + 7866^2 .

It is a cyclic number.

It is not a de Polignac number, because 252175981 - 2⁵ = 252175949 is a prime.

It is a super-2 number, since 2×252175981² = 127185450786624722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252175901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126087990 + 126087991.

It is an arithmetic number, because the mean of its divisors is an integer number (126087991).

Almost surely, 2^252175981 is an apocalyptic number.

It is an amenable number.

252175981 is a deficient number, since it is larger than the sum of its proper divisors (1).

252175981 is an equidigital number, since it uses as much as digits as its factorization.

252175981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The square root of 252175981 is about 15880.0497795190. The cubic root of 252175981 is about 631.7829572036.

The spelling of 252175981 in words is "two hundred fifty-two million, one hundred seventy-five thousand, nine hundred eighty-one".