1002002012191 has 2 divisors, whose sum is σ = 1002002012192. Its totient is φ = 1002002012190.

The previous prime is 1002002012189. The next prime is 1002002012243. The reversal of 1002002012191 is 1912102002001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1002002012191 - 2¹ = 1002002012189 is a prime.

Together with 1002002012189, 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 (1002002012491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501001006095 + 501001006096.

It is an arithmetic number, because the mean of its divisors is an integer number (501001006096).

Almost surely, 2^{1002002012191} is an apocalyptic number.

1002002012191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002002012191 is an equidigital number, since it uses as much as digits as its factorization.

1002002012191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1002002012191 its reverse (1912102002001), we get a palindrome (2914104014192).

The spelling of 1002002012191 in words is "one trillion, two billion, two million, twelve thousand, one hundred ninety-one".