12791971 has 4 divisors (see below), whose sum is σ = 12800344. Its totient is φ = 12783600.

The previous prime is 12791969. The next prime is 12791981. The reversal of 12791971 is 17919721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12791971 - 2¹ = 12791969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12791971.

It is not an unprimeable number, because it can be changed into a prime (12791951) 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, 1170 + ... + 5191.

It is an arithmetic number, because the mean of its divisors is an integer number (3200086).

Almost surely, 2^12791971 is an apocalyptic number.

12791971 is a deficient number, since it is larger than the sum of its proper divisors (8373).

12791971 is an equidigital number, since it uses as much as digits as its factorization.

12791971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8372.

The product of its digits is 7938, while the sum is 37.

The square root of 12791971 is about 3576.5865011209. The cubic root of 12791971 is about 233.8724985385.

It can be divided in two parts, 1 and 2791971, that added together give a palindrome (2791972).

The spelling of 12791971 in words is "twelve million, seven hundred ninety-one thousand, nine hundred seventy-one".