18291838290991 has 2 divisors, whose sum is σ = 18291838290992. Its totient is φ = 18291838290990.

The previous prime is 18291838290989. The next prime is 18291838291007. The reversal of 18291838290991 is 19909283819281.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19909283819281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18291838290991 - 2¹ = 18291838290989 is a prime.

Together with 18291838290989, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18291838290991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18291838290091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145919145495 + 9145919145496.

It is an arithmetic number, because the mean of its divisors is an integer number (9145919145496).

Almost surely, 2^{18291838290991} is an apocalyptic number.

18291838290991 is a deficient number, since it is larger than the sum of its proper divisors (1).

18291838290991 is an equidigital number, since it uses as much as digits as its factorization.

18291838290991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40310784, while the sum is 70.

The spelling of 18291838290991 in words is "eighteen trillion, two hundred ninety-one billion, eight hundred thirty-eight million, two hundred ninety thousand, nine hundred ninety-one".