2188131 has 16 divisors (see below), whose sum is σ = 3237888. Its totient is φ = 1303200.

The previous prime is 2188127. The next prime is 2188157. The reversal of 2188131 is 1318812.

It is not a de Polignac number, because 2188131 - 2² = 2188127 is a prime.

It is a super-2 number, since 2×2188131² = 9575834546322, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2188111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (202368).

2^2188131 is an apocalyptic number.

2188131 is a deficient number, since it is larger than the sum of its proper divisors (1049757).

2188131 is a wasteful number, since it uses less digits than its factorization.

2188131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its digits is 384, while the sum is 24.

The square root of 2188131 is about 1479.2332473278. The cubic root of 2188131 is about 129.8248331131.

It can be divided in two parts, 21881 and 31, that added together give a palindrome (21912).

The spelling of 2188131 in words is "two million, one hundred eighty-eight thousand, one hundred thirty-one".