79791 has 4 divisors (see below), whose sum is σ = 106392. Its totient is φ = 53192.

The previous prime is 79777. The next prime is 79801. The reversal of 79791 is 19797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19797 = 3 ⋅6599.

It is a cyclic number.

It is not a de Polignac number, because 79791 - 2⁹ = 79279 is a prime.

It is a D-number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13296 + ... + 13301.

It is an arithmetic number, because the mean of its divisors is an integer number (26598).

2⁷⁹⁷⁹¹ is an apocalyptic number.

79791 is a deficient number, since it is larger than the sum of its proper divisors (26601).

79791 is a wasteful number, since it uses less digits than its factorization.

79791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26600.

The product of its digits is 3969, while the sum is 33.

The square root of 79791 is about 282.4730075600. The cubic root of 79791 is about 43.0511380059.

It can be divided in two parts, 797 and 91, that multiplied together give a palindrome (72527).

The spelling of 79791 in words is "seventy-nine thousand, seven hundred ninety-one".