251378879 has 2 divisors, whose sum is σ = 251378880. Its totient is φ = 251378878.

The previous prime is 251378867. The next prime is 251378899. The reversal of 251378879 is 978873152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251378879 - 2⁸ = 251378623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251378839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125689439 + 125689440.

It is an arithmetic number, because the mean of its divisors is an integer number (125689440).

Almost surely, 2^251378879 is an apocalyptic number.

251378879 is a deficient number, since it is larger than the sum of its proper divisors (1).

251378879 is an equidigital number, since it uses as much as digits as its factorization.

251378879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 50.

The square root of 251378879 is about 15854.9323240435. The cubic root of 251378879 is about 631.1165879023.

The spelling of 251378879 in words is "two hundred fifty-one million, three hundred seventy-eight thousand, eight hundred seventy-nine".