2215091 has 2 divisors, whose sum is σ = 2215092. Its totient is φ = 2215090.

The previous prime is 2215067. The next prime is 2215097. The reversal of 2215091 is 1905122.

2215091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2215091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2215097) 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 as a sum of consecutive naturals, namely, 1107545 + 1107546.

It is an arithmetic number, because the mean of its divisors is an integer number (1107546).

2^2215091 is an apocalyptic number.

2215091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215091 is an equidigital number, since it uses as much as digits as its factorization.

2215091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 2215091 is about 1488.3181783476. The cubic root of 2215091 is about 130.3558495006.

The spelling of 2215091 in words is "two million, two hundred fifteen thousand, ninety-one".