252401999 has 2 divisors, whose sum is σ = 252402000. Its totient is φ = 252401998.

The previous prime is 252401971. The next prime is 252402001. The reversal of 252401999 is 999104252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 252401999 - 2¹⁶ = 252336463 is a prime.

Together with 252402001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252401939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126200999 + 126201000.

It is an arithmetic number, because the mean of its divisors is an integer number (126201000).

Almost surely, 2^252401999 is an apocalyptic number.

252401999 is a deficient number, since it is larger than the sum of its proper divisors (1).

252401999 is an equidigital number, since it uses as much as digits as its factorization.

252401999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 252401999 is about 15887.1645991347. The cubic root of 252401999 is about 631.9716504068.

The spelling of 252401999 in words is "two hundred fifty-two million, four hundred one thousand, nine hundred ninety-nine".