12890913991 has 2 divisors, whose sum is σ = 12890913992. Its totient is φ = 12890913990.

The previous prime is 12890913989. The next prime is 12890914007. The reversal of 12890913991 is 19931909821.

It is a happy number.

12890913991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12890913991 - 2¹ = 12890913989 is a prime.

Together with 12890913989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12890913961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445456995 + 6445456996.

It is an arithmetic number, because the mean of its divisors is an integer number (6445456996).

Almost surely, 2^12890913991 is an apocalyptic number.

12890913991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12890913991 is an equidigital number, since it uses as much as digits as its factorization.

12890913991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 52.

The spelling of 12890913991 in words is "twelve billion, eight hundred ninety million, nine hundred thirteen thousand, nine hundred ninety-one".