12771971 has 4 divisors (see below), whose sum is σ = 13444200. Its totient is φ = 12099744.

The previous prime is 12771961. The next prime is 12771973. The reversal of 12771971 is 17917721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12771971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12771973) 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, 336086 + ... + 336123.

It is an arithmetic number, because the mean of its divisors is an integer number (3361050).

Almost surely, 2^12771971 is an apocalyptic number.

12771971 is a deficient number, since it is larger than the sum of its proper divisors (672229).

12771971 is an equidigital number, since it uses as much as digits as its factorization.

12771971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672228.

The product of its digits is 6174, while the sum is 35.

The square root of 12771971 is about 3573.7894453927. The cubic root of 12771971 is about 233.7505499143.

The spelling of 12771971 in words is "twelve million, seven hundred seventy-one thousand, nine hundred seventy-one".