2181995793 has 8 divisors (see below), whose sum is σ = 3232586400. Its totient is φ = 1454663844.

The previous prime is 2181995779. The next prime is 2181995839. The reversal of 2181995793 is 3975991812.

It is not a de Polignac number, because 2181995793 - 2⁸ = 2181995537 is a prime.

It is a super-2 number, since 2×2181995793² = 9522211281339397698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2181995773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40407303 + ... + 40407356.

It is an arithmetic number, because the mean of its divisors is an integer number (404073300).

Almost surely, 2^2181995793 is an apocalyptic number.

It is an amenable number.

2181995793 is a deficient number, since it is larger than the sum of its proper divisors (1050590607).

2181995793 is an equidigital number, since it uses as much as digits as its factorization.

2181995793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80814668 (or 80814662 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 2181995793 is about 46711.8378251167. The cubic root of 2181995793 is about 1297.0338276531.

The spelling of 2181995793 in words is "two billion, one hundred eighty-one million, nine hundred ninety-five thousand, seven hundred ninety-three".