2691791 has 4 divisors (see below), whose sum is σ = 2701272. Its totient is φ = 2682312.

The previous prime is 2691781. The next prime is 2691803. The reversal of 2691791 is 1971962.

2691791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1971962 = 2 ⋅985981.

It is a cyclic number.

It is not a de Polignac number, because 2691791 - 2¹⁰ = 2690767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2691701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4301 + ... + 4886.

It is an arithmetic number, because the mean of its divisors is an integer number (675318).

2^2691791 is an apocalyptic number.

2691791 is a deficient number, since it is larger than the sum of its proper divisors (9481).

2691791 is an equidigital number, since it uses as much as digits as its factorization.

2691791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480.

The product of its digits is 6804, while the sum is 35.

The square root of 2691791 is about 1640.6678518213. The cubic root of 2691791 is about 139.1064002542.

The spelling of 2691791 in words is "two million, six hundred ninety-one thousand, seven hundred ninety-one".