102444201991 has 2 divisors, whose sum is σ = 102444201992. Its totient is φ = 102444201990.

The previous prime is 102444201989. The next prime is 102444202001. The reversal of 102444201991 is 199102444201.

It is a weak prime.

It is an emirp because it is prime and its reverse (199102444201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102444201991 - 2¹ = 102444201989 is a prime.

Together with 102444201989, 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 102444201991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102444207991) 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, 51222100995 + 51222100996.

It is an arithmetic number, because the mean of its divisors is an integer number (51222100996).

Almost surely, 2^102444201991 is an apocalyptic number.

102444201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102444201991 is an equidigital number, since it uses as much as digits as its factorization.

102444201991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 102444201991 in words is "one hundred two billion, four hundred forty-four million, two hundred one thousand, nine hundred ninety-one".