1002000331291 has 2 divisors, whose sum is σ = 1002000331292. Its totient is φ = 1002000331290.

The previous prime is 1002000331289. The next prime is 1002000331313. The reversal of 1002000331291 is 1921330002001.

It is an a-pointer prime, because the next prime (1002000331313) can be obtained adding 1002000331291 to its sum of digits (22).

It is a weak prime.

It is an emirp because it is prime and its reverse (1921330002001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1002000331291 - 2¹ = 1002000331289 is a prime.

Together with 1002000331289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1002000331271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501000165645 + 501000165646.

It is an arithmetic number, because the mean of its divisors is an integer number (501000165646).

Almost surely, 2^{1002000331291} is an apocalyptic number.

1002000331291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002000331291 is an equidigital number, since it uses as much as digits as its factorization.

1002000331291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1002000331291 its reverse (1921330002001), we get a palindrome (2923330333292).

The spelling of 1002000331291 in words is "one trillion, two billion, three hundred thirty-one thousand, two hundred ninety-one".