2161696993 has 4 divisors (see below), whose sum is σ = 2162884608. Its totient is φ = 2160509380.

The previous prime is 2161696973. The next prime is 2161697011. The reversal of 2161696993 is 3996961612.

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 2161696993 - 2⁵ = 2161696961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161696993.

It is not an unprimeable number, because it can be changed into a prime (2161696913) 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, 591073 + ... + 594718.

It is an arithmetic number, because the mean of its divisors is an integer number (540721152).

Almost surely, 2^2161696993 is an apocalyptic number.

It is an amenable number.

2161696993 is a deficient number, since it is larger than the sum of its proper divisors (1187615).

2161696993 is a wasteful number, since it uses less digits than its factorization.

2161696993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187614.

The product of its digits is 944784, while the sum is 52.

The square root of 2161696993 is about 46494.0533079232. The cubic root of 2161696993 is about 1292.9992495331. Note that the first 3 decimals are identical.

The spelling of 2161696993 in words is "two billion, one hundred sixty-one million, six hundred ninety-six thousand, nine hundred ninety-three".