111111099999 has 16 divisors (see below), whose sum is σ = 151273787232. Its totient is φ = 72526053888.

The previous prime is 111111099991. The next prime is 111111100007. The reversal of 111111099999 is 999990111111.

It is an interprime number because it is at equal distance from previous prime (111111099991) and next prime (111111100007).

It is not a de Polignac number, because 111111099999 - 2³ = 111111099991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111099991) 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, 1821664 + ... + 1881669.

It is an arithmetic number, because the mean of its divisors is an integer number (9454611702).

Almost surely, 2^111111099999 is an apocalyptic number.

111111099999 is a deficient number, since it is larger than the sum of its proper divisors (40162687233).

111111099999 is a wasteful number, since it uses less digits than its factorization.

111111099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3703546.

The product of its (nonzero) digits is 59049, while the sum is 51.

The spelling of 111111099999 in words is "one hundred eleven billion, one hundred eleven million, ninety-nine thousand, nine hundred ninety-nine".