79971 has 16 divisors (see below), whose sum is σ = 119040. Its totient is φ = 47520.

The previous prime is 79967. The next prime is 79973. The reversal of 79971 is 17997.

It is not a de Polignac number, because 79971 - 2² = 79967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1281 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (7440).

2⁷⁹⁹⁷¹ is an apocalyptic number.

79971 is a deficient number, since it is larger than the sum of its proper divisors (39069).

79971 is a wasteful number, since it uses less digits than its factorization.

79971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106.

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

The square root of 79971 is about 282.7914425862. The cubic root of 79971 is about 43.0834866209.

The spelling of 79971 in words is "seventy-nine thousand, nine hundred seventy-one".