2198091 has 24 divisors (see below), whose sum is σ = 3593280. Its totient is φ = 1188432.

The previous prime is 2198057. The next prime is 2198093. The reversal of 2198091 is 1908912.

It is not a de Polignac number, because 2198091 - 2¹⁵ = 2165323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2198093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2400 + ... + 3186.

It is an arithmetic number, because the mean of its divisors is an integer number (149720).

2^2198091 is an apocalyptic number.

2198091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2198091 is a deficient number, since it is larger than the sum of its proper divisors (1395189).

2198091 is a wasteful number, since it uses less digits than its factorization.

2198091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2198091 is about 1482.5960339890. The cubic root of 2198091 is about 130.0215151767.

The spelling of 2198091 in words is "two million, one hundred ninety-eight thousand, ninety-one".