251496979 has 2 divisors, whose sum is σ = 251496980. Its totient is φ = 251496978.

The previous prime is 251496937. The next prime is 251496983. The reversal of 251496979 is 979694152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251496979 is a prime.

It is a super-2 number, since 2×251496979² = 126501460892252882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251496919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125748489 + 125748490.

It is an arithmetic number, because the mean of its divisors is an integer number (125748490).

Almost surely, 2^251496979 is an apocalyptic number.

251496979 is a deficient number, since it is larger than the sum of its proper divisors (1).

251496979 is an equidigital number, since it uses as much as digits as its factorization.

251496979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 251496979 is about 15858.6562797735. The cubic root of 251496979 is about 631.2154071296.

The spelling of 251496979 in words is "two hundred fifty-one million, four hundred ninety-six thousand, nine hundred seventy-nine".