12971813 has 6 divisors (see below), whose sum is σ = 13690854. Its totient is φ = 12288744.

The previous prime is 12971797. The next prime is 12971831. The reversal of 12971813 is 31817921.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 1014049 = 3458^2 + 1007^2 .

It is not a de Polignac number, because 12971813 - 2⁴ = 12971797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12971813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12971863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17606 + ... + 18327.

It is an arithmetic number, because the mean of its divisors is an integer number (2281809).

Almost surely, 2^12971813 is an apocalyptic number.

It is an amenable number.

12971813 is a deficient number, since it is larger than the sum of its proper divisors (719041).

12971813 is an equidigital number, since it uses as much as digits as its factorization.

12971813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35971 (or 35952 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 12971813 is about 3601.6403207428. The cubic root of 12971813 is about 234.9634045927.

The spelling of 12971813 in words is "twelve million, nine hundred seventy-one thousand, eight hundred thirteen".