1213891113 has 8 divisors (see below), whose sum is σ = 1624494976. Its totient is φ = 806274000.

The previous prime is 1213891109. The next prime is 1213891127. The reversal of 1213891113 is 3111983121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213891113 - 2² = 1213891109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213891183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745738 + ... + 747363.

It is an arithmetic number, because the mean of its divisors is an integer number (203061872).

Almost surely, 2^1213891113 is an apocalyptic number.

It is an amenable number.

1213891113 is a deficient number, since it is larger than the sum of its proper divisors (410603863).

1213891113 is a wasteful number, since it uses less digits than its factorization.

1213891113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493375.

The product of its digits is 1296, while the sum is 30.

The square root of 1213891113 is about 34840.9401853624. The cubic root of 1213891113 is about 1066.7432676217.

The spelling of 1213891113 in words is "one billion, two hundred thirteen million, eight hundred ninety-one thousand, one hundred thirteen".