2165131798 has 16 divisors (see below), whose sum is σ = 3511905984. Its totient is φ = 997206400.

The previous prime is 2165131769. The next prime is 2165131817. The reversal of 2165131798 is 8971315612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675853 + ... + 679048.

It is an arithmetic number, because the mean of its divisors is an integer number (219494124).

Almost surely, 2^2165131798 is an apocalyptic number.

2165131798 is a deficient number, since it is larger than the sum of its proper divisors (1346774186).

2165131798 is a wasteful number, since it uses less digits than its factorization.

2165131798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354967.

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

The square root of 2165131798 is about 46530.9767574247. The cubic root of 2165131798 is about 1293.6837195136.

The spelling of 2165131798 in words is "two billion, one hundred sixty-five million, one hundred thirty-one thousand, seven hundred ninety-eight".