12891737393 has 2 divisors, whose sum is σ = 12891737394. Its totient is φ = 12891737392.

The previous prime is 12891737351. The next prime is 12891737399. The reversal of 12891737393 is 39373719821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12830772529 + 60964864 = 113273^2 + 7808^2 .

It is an emirp because it is prime and its reverse (39373719821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12891737393 - 2¹⁶ = 12891671857 is a prime.

It is not a weakly prime, because it can be changed into another prime (12891737399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445868696 + 6445868697.

It is an arithmetic number, because the mean of its divisors is an integer number (6445868697).

Almost surely, 2^12891737393 is an apocalyptic number.

It is an amenable number.

12891737393 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891737393 is an equidigital number, since it uses as much as digits as its factorization.

12891737393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The spelling of 12891737393 in words is "twelve billion, eight hundred ninety-one million, seven hundred thirty-seven thousand, three hundred ninety-three".