2172131798 has 16 divisors (see below), whose sum is σ = 3314353344. Its totient is φ = 1067376960.

The previous prime is 2172131789. The next prime is 2172131821. The reversal of 2172131798 is 8971312712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155186 + ... + 168602.

It is an arithmetic number, because the mean of its divisors is an integer number (207147084).

Almost surely, 2^2172131798 is an apocalyptic number.

2172131798 is a deficient number, since it is larger than the sum of its proper divisors (1142221546).

2172131798 is a wasteful number, since it uses less digits than its factorization.

2172131798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14807.

The product of its digits is 42336, while the sum is 41.

The square root of 2172131798 is about 46606.1347678608. The cubic root of 2172131798 is about 1295.0764052056.

The spelling of 2172131798 in words is "two billion, one hundred seventy-two million, one hundred thirty-one thousand, seven hundred ninety-eight".