2691989161 has 4 divisors (see below), whose sum is σ = 2809032192. Its totient is φ = 2574946132.

The previous prime is 2691989147. The next prime is 2691989171. The reversal of 2691989161 is 1619891962.

It is a happy number.

2691989161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2691989161 - 2¹¹ = 2691987113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2691989099 and 2691989108.

It is not an unprimeable number, because it can be changed into a prime (2691989171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58521481 + ... + 58521526.

It is an arithmetic number, because the mean of its divisors is an integer number (702258048).

Almost surely, 2^2691989161 is an apocalyptic number.

It is an amenable number.

2691989161 is a deficient number, since it is larger than the sum of its proper divisors (117043031).

2691989161 is a wasteful number, since it uses less digits than its factorization.

2691989161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117043030.

The product of its digits is 419904, while the sum is 52.

The square root of 2691989161 is about 51884.3826309999. The cubic root of 2691989161 is about 1391.0981369241.

The spelling of 2691989161 in words is "two billion, six hundred ninety-one million, nine hundred eighty-nine thousand, one hundred sixty-one".