2161116831 has 16 divisors (see below), whose sum is σ = 2962562688. Its totient is φ = 1400292000.

The previous prime is 2161116827. The next prime is 2161116863. The reversal of 2161116831 is 1386111612.

It is not a de Polignac number, because 2161116831 - 2² = 2161116827 is a prime.

It is a super-2 number, since 2×2161116831² = 9340851914462965122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161112831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97756 + ... + 117806.

It is an arithmetic number, because the mean of its divisors is an integer number (185160168).

Almost surely, 2^2161116831 is an apocalyptic number.

2161116831 is a deficient number, since it is larger than the sum of its proper divisors (801445857).

2161116831 is a wasteful number, since it uses less digits than its factorization.

2161116831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21062.

The product of its digits is 1728, while the sum is 30.

The square root of 2161116831 is about 46487.8137902827. The cubic root of 2161116831 is about 1292.8835663218.

The spelling of 2161116831 in words is "two billion, one hundred sixty-one million, one hundred sixteen thousand, eight hundred thirty-one".