78791 has 2 divisors, whose sum is σ = 78792. Its totient is φ = 78790.

The previous prime is 78787. The next prime is 78797. The reversal of 78791 is 19787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78791 - 2² = 78787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39395 + 39396.

It is an arithmetic number, because the mean of its divisors is an integer number (39396).

2⁷⁸⁷⁹¹ is an apocalyptic number.

78791 is a deficient number, since it is larger than the sum of its proper divisors (1).

78791 is an equidigital number, since it uses as much as digits as its factorization.

78791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 32.

The square root of 78791 is about 280.6973459084. The cubic root of 78791 is about 42.8705317956.

It can be divided in two parts, 787 and 91, that multiplied together give a palindrome (71617).

The spelling of 78791 in words is "seventy-eight thousand, seven hundred ninety-one".