2799991 has 2 divisors, whose sum is σ = 2799992. Its totient is φ = 2799990.

The previous prime is 2799989. The next prime is 2800001. The reversal of 2799991 is 1999972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2799991 - 2¹ = 2799989 is a prime.

Together with 2799989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2799911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1399995 + 1399996.

It is an arithmetic number, because the mean of its divisors is an integer number (1399996).

2^2799991 is an apocalyptic number.

2799991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2799991 is an equidigital number, since it uses as much as digits as its factorization.

2799991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 46.

The square root of 2799991 is about 1673.3173638016. The cubic root of 2799991 is about 140.9458236276.

The spelling of 2799991 in words is "two million, seven hundred ninety-nine thousand, nine hundred ninety-one".