2190091 has 2 divisors, whose sum is σ = 2190092. Its totient is φ = 2190090.

The previous prime is 2190079. The next prime is 2190103. The reversal of 2190091 is 1900912.

It is a balanced prime because it is at equal distance from previous prime (2190079) and next prime (2190103).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2190091 is a prime.

It is not a weakly prime, because it can be changed into another prime (2190031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095045 + 1095046.

It is an arithmetic number, because the mean of its divisors is an integer number (1095046).

2^2190091 is an apocalyptic number.

2190091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190091 is an equidigital number, since it uses as much as digits as its factorization.

2190091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 2190091 is about 1479.8956044262. The cubic root of 2190091 is about 129.8635847136.

The spelling of 2190091 in words is "two million, one hundred ninety thousand, ninety-one".