252397391 has 2 divisors, whose sum is σ = 252397392. Its totient is φ = 252397390.

The previous prime is 252397367. The next prime is 252397399. The reversal of 252397391 is 193793252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252397391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252397399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126198695 + 126198696.

It is an arithmetic number, because the mean of its divisors is an integer number (126198696).

Almost surely, 2^252397391 is an apocalyptic number.

252397391 is a deficient number, since it is larger than the sum of its proper divisors (1).

252397391 is an equidigital number, since it uses as much as digits as its factorization.

252397391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 41.

The square root of 252397391 is about 15887.0195757417. The cubic root of 252397391 is about 631.9678045008.

The spelling of 252397391 in words is "two hundred fifty-two million, three hundred ninety-seven thousand, three hundred ninety-one".