2191168 has 56 divisors (see below), whose sum is σ = 5112512. Its totient is φ = 912384.

The previous prime is 2191159. The next prime is 2191169. The reversal of 2191168 is 8611912.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29980 + ... + 30052.

2^2191168 is an apocalyptic number.

2191168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2556256).

2191168 is an abundant number, since it is smaller than the sum of its proper divisors (2921344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191168 is an equidigital number, since it uses as much as digits as its factorization.

2191168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 149 counting only the distinct ones).

The product of its digits is 864, while the sum is 28.

The square root of 2191168 is about 1480.2594367205. The cubic root of 2191168 is about 129.8848684807.

The spelling of 2191168 in words is "two million, one hundred ninety-one thousand, one hundred sixty-eight".