2191156 has 24 divisors (see below), whose sum is σ = 4404960. Its totient is φ = 943200.

The previous prime is 2191127. The next prime is 2191159. The reversal of 2191156 is 6511912.

2191156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 2191156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (183540).

2^2191156 is an apocalyptic number.

It is an amenable number.

2191156 is an abundant number, since it is smaller than the sum of its proper divisors (2213804).

2191156 is a wasteful number, since it uses less digits than its factorization.

2191156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655 (or 2653 counting only the distinct ones).

The product of its digits is 540, while the sum is 25.

The square root of 2191156 is about 1480.2553833714. The cubic root of 2191156 is about 129.8846313741.

The spelling of 2191156 in words is "two million, one hundred ninety-one thousand, one hundred fifty-six".