7971 has 4 divisors (see below), whose sum is σ = 10632. Its totient is φ = 5312.

The previous prime is 7963. The next prime is 7993. The reversal of 7971 is 1797.

7971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1797 = 3 ⋅599.

It is a cyclic number.

It is not a de Polignac number, because 7971 - 2³ = 7963 is a prime.

It is a D-number.

7971 is a lucky number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (7901) 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, 1326 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (2658).

2⁷⁹⁷¹ is an apocalyptic number.

7971 is a deficient number, since it is larger than the sum of its proper divisors (2661).

7971 is a wasteful number, since it uses less digits than its factorization.

7971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2660.

The product of its digits is 441, while the sum is 24.

The square root of 7971 is about 89.2804569881. The cubic root of 7971 is about 19.9758040730.

The spelling of 7971 in words is "seven thousand, nine hundred seventy-one".