79691 has 2 divisors, whose sum is σ = 79692. Its totient is φ = 79690.

The previous prime is 79687. The next prime is 79693. The reversal of 79691 is 19697.

It is a strong prime.

It is an emirp because it is prime and its reverse (19697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79691 - 2² = 79687 is a prime.

Together with 79693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39845 + 39846.

It is an arithmetic number, because the mean of its divisors is an integer number (39846).

2⁷⁹⁶⁹¹ is an apocalyptic number.

79691 is a deficient number, since it is larger than the sum of its proper divisors (1).

79691 is an equidigital number, since it uses as much as digits as its factorization.

79691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 32.

The square root of 79691 is about 282.2959440020. The cubic root of 79691 is about 43.0331455275.

The spelling of 79691 in words is "seventy-nine thousand, six hundred ninety-one".