2105819 has 2 divisors, whose sum is σ = 2105820. Its totient is φ = 2105818.

The previous prime is 2105813. The next prime is 2105833. The reversal of 2105819 is 9185012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105819 is a prime.

It is a super-2 number, since 2×2105819² = 8868947321522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2105813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052909 + 1052910.

It is an arithmetic number, because the mean of its divisors is an integer number (1052910).

2^2105819 is an apocalyptic number.

2105819 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105819 is an equidigital number, since it uses as much as digits as its factorization.

2105819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 2105819 is about 1451.1440314455. The cubic root of 2105819 is about 128.1760882127.

The spelling of 2105819 in words is "two million, one hundred five thousand, eight hundred nineteen".