1256874979 has 2 divisors, whose sum is σ = 1256874980. Its totient is φ = 1256874978.

The previous prime is 1256874977. The next prime is 1256875001. The reversal of 1256874979 is 9794786521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256874979 - 2¹ = 1256874977 is a prime.

Together with 1256874977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1256874977) 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, 628437489 + 628437490.

It is an arithmetic number, because the mean of its divisors is an integer number (628437490).

Almost surely, 2^1256874979 is an apocalyptic number.

1256874979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256874979 is an equidigital number, since it uses as much as digits as its factorization.

1256874979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 58.

The square root of 1256874979 is about 35452.4326245746. The cubic root of 1256874979 is about 1079.1886278469.

The spelling of 1256874979 in words is "one billion, two hundred fifty-six million, eight hundred seventy-four thousand, nine hundred seventy-nine".