2109796391 has 2 divisors, whose sum is σ = 2109796392. Its totient is φ = 2109796390.

The previous prime is 2109796307. The next prime is 2109796393. The reversal of 2109796391 is 1936979012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2109796391 - 2¹⁰ = 2109795367 is a prime.

It is a super-2 number, since 2×2109796391² = 8902481622953249762, which contains 22 as substring.

Together with 2109796393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109796393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054898195 + 1054898196.

It is an arithmetic number, because the mean of its divisors is an integer number (1054898196).

Almost surely, 2^2109796391 is an apocalyptic number.

2109796391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109796391 is an equidigital number, since it uses as much as digits as its factorization.

2109796391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 2109796391 is about 45932.5199722375. The cubic root of 2109796391 is about 1282.5673550294.

The spelling of 2109796391 in words is "two billion, one hundred nine million, seven hundred ninety-six thousand, three hundred ninety-one".