252449381 has 2 divisors, whose sum is σ = 252449382. Its totient is φ = 252449380.

The previous prime is 252449369. The next prime is 252449389. The reversal of 252449381 is 183944252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139452481 + 112996900 = 11809^2 + 10630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252449381 is a prime.

It is a super-2 number, since 2×252449381² = 127461379934566322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252449389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126224690 + 126224691.

It is an arithmetic number, because the mean of its divisors is an integer number (126224691).

Almost surely, 2^252449381 is an apocalyptic number.

It is an amenable number.

252449381 is a deficient number, since it is larger than the sum of its proper divisors (1).

252449381 is an equidigital number, since it uses as much as digits as its factorization.

252449381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 252449381 is about 15888.6557329436. The cubic root of 252449381 is about 632.0111934206.

The spelling of 252449381 in words is "two hundred fifty-two million, four hundred forty-nine thousand, three hundred eighty-one".