2191799 has 2 divisors, whose sum is σ = 2191800. Its totient is φ = 2191798.

The previous prime is 2191727. The next prime is 2191807. The reversal of 2191799 is 9971912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2191799 - 2²⁰ = 1143223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095899 + 1095900.

It is an arithmetic number, because the mean of its divisors is an integer number (1095900).

2^2191799 is an apocalyptic number.

2191799 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191799 is an equidigital number, since it uses as much as digits as its factorization.

2191799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 38.

The square root of 2191799 is about 1480.4725596917. The cubic root of 2191799 is about 129.8973351174.

The spelling of 2191799 in words is "two million, one hundred ninety-one thousand, seven hundred ninety-nine".