2191198 has 16 divisors (see below), whose sum is σ = 3507840. Its totient is φ = 1026528.

The previous prime is 2191193. The next prime is 2191199. The reversal of 2191198 is 8911912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191193) 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 7 ways as a sum of consecutive naturals, for example, 9715 + ... + 9937.

It is an arithmetic number, because the mean of its divisors is an integer number (219240).

2^2191198 is an apocalyptic number.

2191198 is a deficient number, since it is larger than the sum of its proper divisors (1316642).

2191198 is an equidigital number, since it uses as much as digits as its factorization.

2191198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 242 counting only the distinct ones).

The product of its digits is 1296, while the sum is 31.

The square root of 2191198 is about 1480.2695700446. The cubic root of 2191198 is about 129.8854612435.

It can be divided in two parts, 21 and 91198, that added together give a palindrome (91219).

The spelling of 2191198 in words is "two million, one hundred ninety-one thousand, one hundred ninety-eight".