251382979 has 2 divisors, whose sum is σ = 251382980. Its totient is φ = 251382978.

The previous prime is 251382947. The next prime is 251383007. The reversal of 251382979 is 979283152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251382979 - 2⁵ = 251382947 is a prime.

It is not a weakly prime, because it can be changed into another prime (251382919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125691489 + 125691490.

It is an arithmetic number, because the mean of its divisors is an integer number (125691490).

Almost surely, 2^251382979 is an apocalyptic number.

251382979 is a deficient number, since it is larger than the sum of its proper divisors (1).

251382979 is an equidigital number, since it uses as much as digits as its factorization.

251382979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 251382979 is about 15855.0616208200. The cubic root of 251382979 is about 631.1200190630.

The spelling of 251382979 in words is "two hundred fifty-one million, three hundred eighty-two thousand, nine hundred seventy-nine".