13171971 has 4 divisors (see below), whose sum is σ = 17562632. Its totient is φ = 8781312.

The previous prime is 13171943. The next prime is 13171973. The reversal of 13171971 is 17917131.

It is a happy number.

13171971 is digitally balanced in base 2, 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: 17917131 = 3 ⋅5972377.

It is not a de Polignac number, because 13171971 - 2⁷ = 13171843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13171973) 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, 2195326 + ... + 2195331.

It is an arithmetic number, because the mean of its divisors is an integer number (4390658).

Almost surely, 2^13171971 is an apocalyptic number.

13171971 is a deficient number, since it is larger than the sum of its proper divisors (4390661).

13171971 is an equidigital number, since it uses as much as digits as its factorization.

13171971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4390660.

The product of its digits is 1323, while the sum is 30.

The square root of 13171971 is about 3629.3210108779. The cubic root of 13171971 is about 236.1657542344.

The spelling of 13171971 in words is "thirteen million, one hundred seventy-one thousand, nine hundred seventy-one".