252561917 has 2 divisors, whose sum is σ = 252561918. Its totient is φ = 252561916.

The previous prime is 252561863. The next prime is 252561931. The reversal of 252561917 is 719165252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136913401 + 115648516 = 11701^2 + 10754^2 .

It is a cyclic number.

It is not a de Polignac number, because 252561917 - 2⁶ = 252561853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252561017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126280958 + 126280959.

It is an arithmetic number, because the mean of its divisors is an integer number (126280959).

Almost surely, 2^252561917 is an apocalyptic number.

It is an amenable number.

252561917 is a deficient number, since it is larger than the sum of its proper divisors (1).

252561917 is an equidigital number, since it uses as much as digits as its factorization.

252561917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 38.

The square root of 252561917 is about 15892.1967329882. The cubic root of 252561917 is about 632.1050913808.

The spelling of 252561917 in words is "two hundred fifty-two million, five hundred sixty-one thousand, nine hundred seventeen".