2791 has 2 divisors, whose sum is σ = 2792.
Its totient is φ = 2790.
The previous prime is 2789. The next prime is 2797. The reversal of 2791 is 1972.
2791 = 192 + 202 + ... + 242.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 2791 - 21 = 2789 is a prime.
Together with 2789, it forms a pair of twin primes.
It is a plaindrome in base 13.
It is a nialpdrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2797) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1395 + 1396.
It is an arithmetic number, because the mean of its divisors is an integer number (1396).
22791 is an apocalyptic number.
2791 is the 31-st hex number.
2791 is a deficient number, since it is larger than the sum of its proper divisors (1).
2791 is an equidigital number, since it uses as much as digits as its factorization.
2791 is an evil number, because the sum of its binary digits is even.
The product of its digits is 126, while the sum is 19.
The square root of 2791 is about 52.8299157675.
The cubic root of 2791 is about 14.0794799007.
Subtracting from 2791 its sum of digits (19), we obtain a palindrome (2772).
The spelling of 2791 in words is "two thousand, seven hundred ninety-one".