2181798279 has 12 divisors (see below), whose sum is σ = 3160521000. Its totient is φ = 1450362384.

The previous prime is 2181798217. The next prime is 2181798299. The reversal of 2181798279 is 9728971812.

It is not a de Polignac number, because 2181798279 - 2¹¹ = 2181796231 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181798299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344169 + ... + 350450.

It is an arithmetic number, because the mean of its divisors is an integer number (263376750).

Almost surely, 2^2181798279 is an apocalyptic number.

2181798279 is a deficient number, since it is larger than the sum of its proper divisors (978722721).

2181798279 is a wasteful number, since it uses less digits than its factorization.

2181798279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694974 (or 694971 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 2181798279 is about 46709.7236022651. The cubic root of 2181798279 is about 1296.9946906895.

The spelling of 2181798279 in words is "two billion, one hundred eighty-one million, seven hundred ninety-eight thousand, two hundred seventy-nine".