2161793493 has 6 divisors (see below), whose sum is σ = 3122590614. Its totient is φ = 1441195656.

The previous prime is 2161793467. The next prime is 2161793497. The reversal of 2161793493 is 3943971612.

2161793493 is a `hidden beast` number, since 21 + 617 + 9 + 3 + 4 + 9 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2143875204 + 17918289 = 46302^2 + 4233^2 .

It is not a de Polignac number, because 2161793493 - 2²² = 2157599189 is a prime.

It is a super-2 number, since 2×2161793493² = 9346702212754282098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161793497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120099630 + ... + 120099647.

It is an arithmetic number, because the mean of its divisors is an integer number (520431769).

Almost surely, 2^2161793493 is an apocalyptic number.

It is an amenable number.

2161793493 is a deficient number, since it is larger than the sum of its proper divisors (960797121).

2161793493 is a wasteful number, since it uses less digits than its factorization.

2161793493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240199283 (or 240199280 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 2161793493 is about 46495.0910634660. The cubic root of 2161793493 is about 1293.0184894437.

The spelling of 2161793493 in words is "two billion, one hundred sixty-one million, seven hundred ninety-three thousand, four hundred ninety-three".