1100019989 has 4 divisors (see below), whose sum is σ = 1103603424. Its totient is φ = 1096436556.

The previous prime is 1100019961. The next prime is 1100020021. The reversal of 1100019989 is 9899100011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100019989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100019889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1791257 + ... + 1791870.

It is an arithmetic number, because the mean of its divisors is an integer number (275900856).

Almost surely, 2^1100019989 is an apocalyptic number.

It is an amenable number.

1100019989 is a deficient number, since it is larger than the sum of its proper divisors (3583435).

1100019989 is an equidigital number, since it uses as much as digits as its factorization.

1100019989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583434.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 1100019989 is about 33166.5492476984. The cubic root of 1100019989 is about 1032.2863682207.

The spelling of 1100019989 in words is "one billion, one hundred million, nineteen thousand, nine hundred eighty-nine".