12971731 has 4 divisors (see below), whose sum is σ = 13734792. Its totient is φ = 12208672.

The previous prime is 12971683. The next prime is 12971743. The reversal of 12971731 is 13717921.

12971731 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.

It is a cyclic number.

It is not a de Polignac number, because 12971731 - 2⁷ = 12971603 is a prime.

It is a super-2 number, since 2×12971731² = 336531610272722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12971693 and 12971702.

It is not an unprimeable number, because it can be changed into a prime (12971831) 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, 381505 + ... + 381538.

It is an arithmetic number, because the mean of its divisors is an integer number (3433698).

Almost surely, 2^12971731 is an apocalyptic number.

12971731 is a deficient number, since it is larger than the sum of its proper divisors (763061).

12971731 is an equidigital number, since it uses as much as digits as its factorization.

12971731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763060.

The product of its digits is 2646, while the sum is 31.

The square root of 12971731 is about 3601.6289370228. The cubic root of 12971731 is about 234.9629094926.

The spelling of 12971731 in words is "twelve million, nine hundred seventy-one thousand, seven hundred thirty-one".