2188291 has 24 divisors (see below), whose sum is σ = 2807136. Its totient is φ = 1693440.

The previous prime is 2188283. The next prime is 2188297. The reversal of 2188291 is 1928812.

It is a happy number.

It is not a de Polignac number, because 2188291 - 2³ = 2188283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2188297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30786 + ... + 30856.

It is an arithmetic number, because the mean of its divisors is an integer number (116964).

2^2188291 is an apocalyptic number.

2188291 is a deficient number, since it is larger than the sum of its proper divisors (618845).

2188291 is a wasteful number, since it uses less digits than its factorization.

2188291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 132 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 2188291 is about 1479.2873284119. The cubic root of 2188291 is about 129.8279973763.

The spelling of 2188291 in words is "two million, one hundred eighty-eight thousand, two hundred ninety-one".