2115791 has 2 divisors, whose sum is σ = 2115792. Its totient is φ = 2115790.

The previous prime is 2115787. The next prime is 2115823. The reversal of 2115791 is 1975112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2115791 - 2² = 2115787 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2115791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057895 + 1057896.

It is an arithmetic number, because the mean of its divisors is an integer number (1057896).

2^2115791 is an apocalyptic number.

2115791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115791 is an equidigital number, since it uses as much as digits as its factorization.

2115791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 26.

The square root of 2115791 is about 1454.5758832044. The cubic root of 2115791 is about 128.3780934926.

The spelling of 2115791 in words is "two million, one hundred fifteen thousand, seven hundred ninety-one".