1256745115 has 16 divisors (see below), whose sum is σ = 1560084480. Its totient is φ = 970875360.

The previous prime is 1256745109. The next prime is 1256745167. The reversal of 1256745115 is 5115476521.

It is not a de Polignac number, because 1256745115 - 2³ = 1256745107 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65782 + ... + 82708.

It is an arithmetic number, because the mean of its divisors is an integer number (97505280).

Almost surely, 2^1256745115 is an apocalyptic number.

1256745115 is a deficient number, since it is larger than the sum of its proper divisors (303339365).

1256745115 is a wasteful number, since it uses less digits than its factorization.

1256745115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17442.

The product of its digits is 42000, while the sum is 37.

The square root of 1256745115 is about 35450.6010527325. The cubic root of 1256745115 is about 1079.1514582579.

The spelling of 1256745115 in words is "one billion, two hundred fifty-six million, seven hundred forty-five thousand, one hundred fifteen".