12721693 has 2 divisors, whose sum is σ = 12721694. Its totient is φ = 12721692.

The previous prime is 12721663. The next prime is 12721703. The reversal of 12721693 is 39612721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11471769 + 1249924 = 3387^2 + 1118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12721693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721663) 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, 6360846 + 6360847.

It is an arithmetic number, because the mean of its divisors is an integer number (6360847).

Almost surely, 2^12721693 is an apocalyptic number.

It is an amenable number.

12721693 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721693 is an equidigital number, since it uses as much as digits as its factorization.

12721693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 12721693 is about 3566.7482389426. The cubic root of 12721693 is about 233.4434199351.

The spelling of 12721693 in words is "twelve million, seven hundred twenty-one thousand, six hundred ninety-three".