1002001211989 has 2 divisors, whose sum is σ = 1002001211990. Its totient is φ = 1002001211988.

The previous prime is 1002001211873. The next prime is 1002001212011. The reversal of 1002001211989 is 9891121002001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 983750552964 + 18250659025 = 991842^2 + 135095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002001211989 is a prime.

It is a super-2 number, since 2×1002001211989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002001211689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501000605994 + 501000605995.

It is an arithmetic number, because the mean of its divisors is an integer number (501000605995).

Almost surely, 2^{1002001211989} is an apocalyptic number.

It is an amenable number.

1002001211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002001211989 is an equidigital number, since it uses as much as digits as its factorization.

1002001211989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 1002001211989 in words is "one trillion, two billion, one million, two hundred eleven thousand, nine hundred eighty-nine".