1009999111 has 16 divisors (see below), whose sum is σ = 1141672320. Its totient is φ = 885557920.

The previous prime is 1009999099. The next prime is 1009999129. The reversal of 1009999111 is 1119999001.

It is not a de Polignac number, because 1009999111 - 2⁵ = 1009999079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009999141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19716 + ... + 49078.

It is an arithmetic number, because the mean of its divisors is an integer number (71354520).

Almost surely, 2^1009999111 is an apocalyptic number.

1009999111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1009999111 is a deficient number, since it is larger than the sum of its proper divisors (131673209).

1009999111 is a wasteful number, since it uses less digits than its factorization.

1009999111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29486.

The product of its (nonzero) digits is 6561, while the sum is 40.

The square root of 1009999111 is about 31780.4831775730. The cubic root of 1009999111 is about 1003.3219891679.

The spelling of 1009999111 in words is "one billion, nine million, nine hundred ninety-nine thousand, one hundred eleven".