79891 has 8 divisors (see below), whose sum is σ = 93024. Its totient is φ = 67200.

The previous prime is 79889. The next prime is 79901. The reversal of 79891 is 19897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79891 - 2¹ = 79889 is a prime.

It is a Duffinian number.

79891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (79801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (11628).

2⁷⁹⁸⁹¹ is an apocalyptic number.

79891 is a deficient number, since it is larger than the sum of its proper divisors (13133).

79891 is a wasteful number, since it uses less digits than its factorization.

79891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221.

The product of its digits is 4536, while the sum is 34.

The square root of 79891 is about 282.6499601981. The cubic root of 79891 is about 43.0691154577.

The spelling of 79891 in words is "seventy-nine thousand, eight hundred ninety-one".