12731438989 has 2 divisors, whose sum is σ = 12731438990. Its totient is φ = 12731438988.

The previous prime is 12731438983. The next prime is 12731439121. The reversal of 12731438989 is 98983413721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12705122089 + 26316900 = 112717^2 + 5130^2 .

It is an emirp because it is prime and its reverse (98983413721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12731438989 - 2³ = 12731438981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12731438981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6365719494 + 6365719495.

It is an arithmetic number, because the mean of its divisors is an integer number (6365719495).

Almost surely, 2^12731438989 is an apocalyptic number.

It is an amenable number.

12731438989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12731438989 is an equidigital number, since it uses as much as digits as its factorization.

12731438989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The spelling of 12731438989 in words is "twelve billion, seven hundred thirty-one million, four hundred thirty-eight thousand, nine hundred eighty-nine".