2195891 has 2 divisors, whose sum is σ = 2195892. Its totient is φ = 2195890.

The previous prime is 2195867. The next prime is 2195899. The reversal of 2195891 is 1985912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2195891 - 2⁶ = 2195827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2195899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097945 + 1097946.

It is an arithmetic number, because the mean of its divisors is an integer number (1097946).

2^2195891 is an apocalyptic number.

2195891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195891 is an equidigital number, since it uses as much as digits as its factorization.

2195891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 35.

The square root of 2195891 is about 1481.8539064294. The cubic root of 2195891 is about 129.9781225512.

The spelling of 2195891 in words is "two million, one hundred ninety-five thousand, eight hundred ninety-one".