1001111109989 has 2 divisors, whose sum is σ = 1001111109990. Its totient is φ = 1001111109988.

The previous prime is 1001111109967. The next prime is 1001111110039. The reversal of 1001111109989 is 9899011111001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000866187489 + 244922500 = 1000433^2 + 15650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001111109989 - 2²⁴ = 1001094332773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001111109919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500555554994 + 500555554995.

It is an arithmetic number, because the mean of its divisors is an integer number (500555554995).

Almost surely, 2^{1001111109989} is an apocalyptic number.

It is an amenable number.

1001111109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001111109989 is an equidigital number, since it uses as much as digits as its factorization.

1001111109989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 41.

The spelling of 1001111109989 in words is "one trillion, one billion, one hundred eleven million, one hundred nine thousand, nine hundred eighty-nine".