12813989 has 2 divisors, whose sum is σ = 12813990. Its totient is φ = 12813988.

The previous prime is 12813979. The next prime is 12814019. The reversal of 12813989 is 98931821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10349089 + 2464900 = 3217^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 12813989 - 2⁴ = 12813973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12813929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6406994 + 6406995.

It is an arithmetic number, because the mean of its divisors is an integer number (6406995).

Almost surely, 2^12813989 is an apocalyptic number.

It is an amenable number.

12813989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12813989 is an equidigital number, since it uses as much as digits as its factorization.

12813989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 12813989 is about 3579.6632523186. The cubic root of 12813989 is about 234.0066048736.

The spelling of 12813989 in words is "twelve million, eight hundred thirteen thousand, nine hundred eighty-nine".