2161798315 has 4 divisors (see below), whose sum is σ = 2594157984. Its totient is φ = 1729438648.

The previous prime is 2161798307. The next prime is 2161798333. The reversal of 2161798315 is 5138971612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161798315 - 2³ = 2161798307 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216179827 + ... + 216179836.

It is an arithmetic number, because the mean of its divisors is an integer number (648539496).

Almost surely, 2^2161798315 is an apocalyptic number.

2161798315 is a deficient number, since it is larger than the sum of its proper divisors (432359669).

2161798315 is an equidigital number, since it uses as much as digits as its factorization.

2161798315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432359668.

The product of its digits is 90720, while the sum is 43.

The square root of 2161798315 is about 46495.1429183737. The cubic root of 2161798315 is about 1293.0194508261.

The spelling of 2161798315 in words is "two billion, one hundred sixty-one million, seven hundred ninety-eight thousand, three hundred fifteen".