12813649 has 2 divisors, whose sum is σ = 12813650. Its totient is φ = 12813648.

The previous prime is 12813643. The next prime is 12813653. The reversal of 12813649 is 94631821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 1117249 = 3420^2 + 1057^2 .

It is a cyclic number.

It is not a de Polignac number, because 12813649 - 2³ = 12813641 is a prime.

It is not a weakly prime, because it can be changed into another prime (12813641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6406824 + 6406825.

It is an arithmetic number, because the mean of its divisors is an integer number (6406825).

Almost surely, 2^12813649 is an apocalyptic number.

It is an amenable number.

12813649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12813649 is an equidigital number, since it uses as much as digits as its factorization.

12813649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 12813649 is about 3579.6157615029. The cubic root of 12813649 is about 234.0045351837.

The spelling of 12813649 in words is "twelve million, eight hundred thirteen thousand, six hundred forty-nine".