2111191985 has 32 divisors (see below), whose sum is σ = 2950974720. Its totient is φ = 1419973632.

The previous prime is 2111191969. The next prime is 2111192003. The reversal of 2111191985 is 5891911112.

It is not a de Polignac number, because 2111191985 - 2⁴ = 2111191969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1273277 + ... + 1274933.

It is an arithmetic number, because the mean of its divisors is an integer number (92217960).

Almost surely, 2^2111191985 is an apocalyptic number.

It is an amenable number.

2111191985 is a deficient number, since it is larger than the sum of its proper divisors (839782735).

2111191985 is a wasteful number, since it uses less digits than its factorization.

2111191985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345.

The product of its digits is 6480, while the sum is 38.

The square root of 2111191985 is about 45947.7092464902. The cubic root of 2111191985 is about 1282.8500914403.

The spelling of 2111191985 in words is "two billion, one hundred eleven million, one hundred ninety-one thousand, nine hundred eighty-five".