2191555 has 32 divisors (see below), whose sum is σ = 3110400. Its totient is φ = 1469952.

The previous prime is 2191549. The next prime is 2191561. The reversal of 2191555 is 5551912.

It is an interprime number because it is at equal distance from previous prime (2191549) and next prime (2191561).

It is a cyclic number.

It is not a de Polignac number, because 2191555 - 2⁵ = 2191523 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37116 + ... + 37174.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2^2191555 is an apocalyptic number.

2191555 is a deficient number, since it is larger than the sum of its proper divisors (918845).

2191555 is a wasteful number, since it uses less digits than its factorization.

2191555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123.

The product of its digits is 2250, while the sum is 28.

The square root of 2191555 is about 1480.3901512777. The cubic root of 2191555 is about 129.8925147049.

The spelling of 2191555 in words is "two million, one hundred ninety-one thousand, five hundred fifty-five".