12731993 has 2 divisors, whose sum is σ = 12731994. Its totient is φ = 12731992.

The previous prime is 12731989. The next prime is 12732001. The reversal of 12731993 is 39913721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12730624 + 1369 = 3568^2 + 37^2 .

It is an emirp because it is prime and its reverse (39913721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12731993 - 2² = 12731989 is a prime.

It is not a weakly prime, because it can be changed into another prime (12731923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6365996 + 6365997.

It is an arithmetic number, because the mean of its divisors is an integer number (6365997).

Almost surely, 2^12731993 is an apocalyptic number.

It is an amenable number.

12731993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12731993 is an equidigital number, since it uses as much as digits as its factorization.

12731993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 35.

The square root of 12731993 is about 3568.1918390131. The cubic root of 12731993 is about 233.5064047018.

The spelling of 12731993 in words is "twelve million, seven hundred thirty-one thousand, nine hundred ninety-three".