2091155 has 16 divisors (see below), whose sum is σ = 2765664. Its totient is φ = 1505280.

The previous prime is 2091151. The next prime is 2091191. The reversal of 2091155 is 5511902.

It is not a de Polignac number, because 2091155 - 2² = 2091151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2091155.

It is not an unprimeable number, because it can be changed into a prime (2091151) 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 15 ways as a sum of consecutive naturals, for example, 10517 + ... + 10713.

It is an arithmetic number, because the mean of its divisors is an integer number (172854).

2^2091155 is an apocalyptic number.

2091155 is a deficient number, since it is larger than the sum of its proper divisors (674509).

2091155 is a wasteful number, since it uses less digits than its factorization.

2091155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 2091155 is about 1446.0826394090. The cubic root of 2091155 is about 127.8778742386.

The spelling of 2091155 in words is "two million, ninety-one thousand, one hundred fifty-five".