2161831617 has 36 divisors (see below), whose sum is σ = 3581602752. Its totient is φ = 1253221200.

The previous prime is 2161831591. The next prime is 2161831619. The reversal of 2161831617 is 7161381612.

2161831617 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 8 + 31 + 617 = 666.

It is not a de Polignac number, because 2161831617 - 2⁷ = 2161831489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161831619) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18109 + ... + 68202.

Almost surely, 2^2161831617 is an apocalyptic number.

It is an amenable number.

2161831617 is a deficient number, since it is larger than the sum of its proper divisors (1419771135).

2161831617 is a wasteful number, since it uses less digits than its factorization.

2161831617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86362 (or 86348 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 2161831617 is about 46495.5010404233. The cubic root of 2161831617 is about 1293.0260903466.

It can be divided in two parts, 21618 and 31617, that added together give a palindrome (53235).

The spelling of 2161831617 in words is "two billion, one hundred sixty-one million, eight hundred thirty-one thousand, six hundred seventeen".