1256641113 has 24 divisors (see below), whose sum is σ = 2099008128. Its totient is φ = 662842656.

The previous prime is 1256641093. The next prime is 1256641121. The reversal of 1256641113 is 3111466521.

It is a happy number.

It is not a de Polignac number, because 1256641113 - 2⁵ = 1256641081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256641123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326881 + ... + 330702.

It is an arithmetic number, because the mean of its divisors is an integer number (87458672).

Almost surely, 2^1256641113 is an apocalyptic number.

1256641113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1256641113 is a deficient number, since it is larger than the sum of its proper divisors (842367015).

1256641113 is a wasteful number, since it uses less digits than its factorization.

1256641113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657613 (or 657606 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 1256641113 is about 35449.1341643206. The cubic root of 1256641113 is about 1079.1216890272.

The spelling of 1256641113 in words is "one billion, two hundred fifty-six million, six hundred forty-one thousand, one hundred thirteen".