2188331172 has 18 divisors (see below), whose sum is σ = 5531614998. Its totient is φ = 729443712.

The previous prime is 2188331129. The next prime is 2188331179. The reversal of 2188331172 is 2711338812.

It can be written as a sum of positive squares in only one way, i.e., 1257837156 + 930494016 = 35466^2 + 30504^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 60786977 = 2188331172 / (2 + 1 + 8 + 8 + 3 + 3 + 1 + 1 + 7 + 2).

It is not an unprimeable number, because it can be changed into a prime (2188331179) 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 5 ways as a sum of consecutive naturals, for example, 30393453 + ... + 30393524.

Almost surely, 2^2188331172 is an apocalyptic number.

It is an amenable number.

2188331172 is an abundant number, since it is smaller than the sum of its proper divisors (3343283826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2188331172 is a wasteful number, since it uses less digits than its factorization.

2188331172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60786987 (or 60786982 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 2188331172 is about 46779.6020932201. The cubic root of 2188331172 is about 1298.2879181942.

Adding to 2188331172 its reverse (2711338812), we get a palindrome (4899669984).

The spelling of 2188331172 in words is "two billion, one hundred eighty-eight million, three hundred thirty-one thousand, one hundred seventy-two".