291791 has 2 divisors, whose sum is σ = 291792. Its totient is φ = 291790.

The previous prime is 291779. The next prime is 291817. The reversal of 291791 is 197192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291791 - 2⁶ = 291727 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291791.

It is not a weakly prime, because it can be changed into another prime (291701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145895 + 145896.

It is an arithmetic number, because the mean of its divisors is an integer number (145896).

2²⁹¹⁷⁹¹ is an apocalyptic number.

291791 is a deficient number, since it is larger than the sum of its proper divisors (1).

291791 is an equidigital number, since it uses as much as digits as its factorization.

291791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 29.

The square root of 291791 is about 540.1768229015. The cubic root of 291791 is about 66.3270422109.

It can be divided in two parts, 291 and 791, that multiplied together give a triangular number (230181 = T₆₇₈).

The spelling of 291791 in words is "two hundred ninety-one thousand, seven hundred ninety-one".