251255399 has 2 divisors, whose sum is σ = 251255400. Its totient is φ = 251255398.

The previous prime is 251255383. The next prime is 251255437. The reversal of 251255399 is 993552152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251255399 - 2⁴ = 251255383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251255309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125627699 + 125627700.

It is an arithmetic number, because the mean of its divisors is an integer number (125627700).

Almost surely, 2^251255399 is an apocalyptic number.

251255399 is a deficient number, since it is larger than the sum of its proper divisors (1).

251255399 is an equidigital number, since it uses as much as digits as its factorization.

251255399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121500, while the sum is 41.

The square root of 251255399 is about 15851.0377893689. The cubic root of 251255399 is about 631.0132338999.

The spelling of 251255399 in words is "two hundred fifty-one million, two hundred fifty-five thousand, three hundred ninety-nine".