2161798279 has 2 divisors, whose sum is σ = 2161798280. Its totient is φ = 2161798278.

The previous prime is 2161798271. The next prime is 2161798307. The reversal of 2161798279 is 9728971612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161798279 - 2³ = 2161798271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161798271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080899139 + 1080899140.

It is an arithmetic number, because the mean of its divisors is an integer number (1080899140).

Almost surely, 2^2161798279 is an apocalyptic number.

2161798279 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161798279 is an equidigital number, since it uses as much as digits as its factorization.

2161798279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 52.

The square root of 2161798279 is about 46495.1425312365. The cubic root of 2161798279 is about 1293.0194436486.

The spelling of 2161798279 in words is "two billion, one hundred sixty-one million, seven hundred ninety-eight thousand, two hundred seventy-nine".