2791991 has 2 divisors, whose sum is σ = 2791992. Its totient is φ = 2791990.

The previous prime is 2791981. The next prime is 2792011. The reversal of 2791991 is 1991972.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2791991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2791981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1395995 + 1395996.

It is an arithmetic number, because the mean of its divisors is an integer number (1395996).

2^2791991 is an apocalyptic number.

2791991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2791991 is an equidigital number, since it uses as much as digits as its factorization.

2791991 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 2791991 is about 1670.9251928198. The cubic root of 2791991 is about 140.8114610322.

The spelling of 2791991 in words is "two million, seven hundred ninety-one thousand, nine hundred ninety-one".