251255369 has 2 divisors, whose sum is σ = 251255370. Its totient is φ = 251255368.

The previous prime is 251255309. The next prime is 251255383. The reversal of 251255369 is 963552152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177209344 + 74046025 = 13312^2 + 8605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251255369 is a prime.

It is a super-2 number, since 2×251255369² = 126258520902652322, which contains 22 as substring.

It is a Chen prime.

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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125627684 + 125627685.

It is an arithmetic number, because the mean of its divisors is an integer number (125627685).

Almost surely, 2^251255369 is an apocalyptic number.

It is an amenable number.

251255369 is a deficient number, since it is larger than the sum of its proper divisors (1).

251255369 is an equidigital number, since it uses as much as digits as its factorization.

251255369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 38.

The square root of 251255369 is about 15851.0368430586. The cubic root of 251255369 is about 631.0132087855.

The spelling of 251255369 in words is "two hundred fifty-one million, two hundred fifty-five thousand, three hundred sixty-nine".