79811 has 2 divisors, whose sum is σ = 79812. Its totient is φ = 79810.

The previous prime is 79801. The next prime is 79813. The reversal of 79811 is 11897.

It is a strong prime.

It is an emirp because it is prime and its reverse (11897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79811 - 2¹⁰ = 78787 is a prime.

It is a Sophie Germain prime.

Together with 79813, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (79813) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39905 + 39906.

It is an arithmetic number, because the mean of its divisors is an integer number (39906).

2⁷⁹⁸¹¹ is an apocalyptic number.

79811 is a deficient number, since it is larger than the sum of its proper divisors (1).

79811 is an equidigital number, since it uses as much as digits as its factorization.

79811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 26.

The square root of 79811 is about 282.5084069546. The cubic root of 79811 is about 43.0547346974.

It can be divided in two parts, 798 and 11, that multiplied together give a palindrome (8778).

The spelling of 79811 in words is "seventy-nine thousand, eight hundred eleven".