1256791679 has 16 divisors (see below), whose sum is σ = 1479045120. Its totient is φ = 1052840160.

The previous prime is 1256791663. The next prime is 1256791681. The reversal of 1256791679 is 9761976521.

It is a cyclic number.

It is not a de Polignac number, because 1256791679 - 2⁴ = 1256791663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256791679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256791639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79562 + ... + 94040.

It is an arithmetic number, because the mean of its divisors is an integer number (92440320).

Almost surely, 2^1256791679 is an apocalyptic number.

1256791679 is a deficient number, since it is larger than the sum of its proper divisors (222253441).

1256791679 is a wasteful number, since it uses less digits than its factorization.

1256791679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15110.

The product of its digits is 1428840, while the sum is 53.

The square root of 1256791679 is about 35451.2577915086. The cubic root of 1256791679 is about 1079.1647860699.

The spelling of 1256791679 in words is "one billion, two hundred fifty-six million, seven hundred ninety-one thousand, six hundred seventy-nine".