2083691891 has 2 divisors, whose sum is σ = 2083691892. Its totient is φ = 2083691890.

The previous prime is 2083691861. The next prime is 2083691933. The reversal of 2083691891 is 1981963802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2083691891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2083691821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1041845945 + 1041845946.

It is an arithmetic number, because the mean of its divisors is an integer number (1041845946).

Almost surely, 2^2083691891 is an apocalyptic number.

2083691891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2083691891 is an equidigital number, since it uses as much as digits as its factorization.

2083691891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 2083691891 is about 45647.4740922211. The cubic root of 2083691891 is about 1277.2556540854.

The spelling of 2083691891 in words is "two billion, eighty-three million, six hundred ninety-one thousand, eight hundred ninety-one".