12978313 has 2 divisors, whose sum is σ = 12978314. Its totient is φ = 12978312.

The previous prime is 12978307. The next prime is 12978323. The reversal of 12978313 is 31387921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10582009 + 2396304 = 3253^2 + 1548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12978313 is a prime.

It is not a weakly prime, because it can be changed into another prime (12978323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6489156 + 6489157.

It is an arithmetic number, because the mean of its divisors is an integer number (6489157).

Almost surely, 2^12978313 is an apocalyptic number.

It is an amenable number.

12978313 is a deficient number, since it is larger than the sum of its proper divisors (1).

12978313 is an equidigital number, since it uses as much as digits as its factorization.

12978313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 12978313 is about 3602.5425743494. The cubic root of 12978313 is about 235.0026437005.

The spelling of 12978313 in words is "twelve million, nine hundred seventy-eight thousand, three hundred thirteen".