1111001999 has 2 divisors, whose sum is σ = 1111002000. Its totient is φ = 1111001998.

The previous prime is 1111001971. The next prime is 1111002049. The reversal of 1111001999 is 9991001111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1111001999 - 2⁸ = 1111001743 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111001929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555500999 + 555501000.

It is an arithmetic number, because the mean of its divisors is an integer number (555501000).

Almost surely, 2^1111001999 is an apocalyptic number.

1111001999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111001999 is an equidigital number, since it uses as much as digits as its factorization.

1111001999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 32.

The square root of 1111001999 is about 33331.6966114838. The cubic root of 1111001999 is about 1035.7102638716.

The spelling of 1111001999 in words is "one billion, one hundred eleven million, one thousand, nine hundred ninety-nine".