2091863 has 2 divisors, whose sum is σ = 2091864. Its totient is φ = 2091862.

The previous prime is 2091851. The next prime is 2091871. The reversal of 2091863 is 3681902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2091863 - 2⁴ = 2091847 is a prime.

It is a Sophie Germain 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 (2091763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045931 + 1045932.

It is an arithmetic number, because the mean of its divisors is an integer number (1045932).

2^2091863 is an apocalyptic number.

2091863 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091863 is an equidigital number, since it uses as much as digits as its factorization.

2091863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2091863 is about 1446.3274179798. The cubic root of 2091863 is about 127.8923044330.

The spelling of 2091863 in words is "two million, ninety-one thousand, eight hundred sixty-three".