251378923 has 2 divisors, whose sum is σ = 251378924. Its totient is φ = 251378922.

The previous prime is 251378917. The next prime is 251378927. The reversal of 251378923 is 329873152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251378923 - 2²¹ = 249281771 is a prime.

It is not a weakly prime, because it can be changed into another prime (251378927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125689461 + 125689462.

It is an arithmetic number, because the mean of its divisors is an integer number (125689462).

Almost surely, 2^251378923 is an apocalyptic number.

251378923 is a deficient number, since it is larger than the sum of its proper divisors (1).

251378923 is an equidigital number, since it uses as much as digits as its factorization.

251378923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 251378923 is about 15854.9337116243. The cubic root of 251378923 is about 631.1166247248.

The spelling of 251378923 in words is "two hundred fifty-one million, three hundred seventy-eight thousand, nine hundred twenty-three".