2116909161 has 10 divisors (see below), whose sum is σ = 3162296522. Its totient is φ = 1411272720.

The previous prime is 2116909147. The next prime is 2116909181. The reversal of 2116909161 is 1619096112.

It can be written as a sum of positive squares in only one way, i.e., 1351003536 + 765905625 = 36756^2 + 27675^2 .

It is not a de Polignac number, because 2116909161 - 2⁵ = 2116909129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116909181) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13067260 + ... + 13067421.

Almost surely, 2^2116909161 is an apocalyptic number.

It is an amenable number.

2116909161 is a deficient number, since it is larger than the sum of its proper divisors (1045387361).

2116909161 is an equidigital number, since it uses as much as digits as its factorization.

2116909161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26134693 (or 26134684 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 2116909161 is about 46009.8811235152. The cubic root of 2116909161 is about 1284.0070475201.

The spelling of 2116909161 in words is "two billion, one hundred sixteen million, nine hundred nine thousand, one hundred sixty-one".