111111111001009 has 4 divisors (see below), whose sum is σ = 126984126858304. Its totient is φ = 95238095143716.

The previous prime is 111111111000991. The next prime is 111111111001021. The reversal of 111111111001009 is 900100111111111.

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 not a de Polignac number, because 111111111001009 - 2⁷ = 111111111000881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111111001069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7936507928637 + ... + 7936507928650.

It is an arithmetic number, because the mean of its divisors is an integer number (31746031714576).

Almost surely, 2^{111111111001009} is an apocalyptic number.

It is an amenable number.

111111111001009 is a deficient number, since it is larger than the sum of its proper divisors (15873015857295).

111111111001009 is an equidigital number, since it uses as much as digits as its factorization.

111111111001009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15873015857294.

The product of its (nonzero) digits is 9, while the sum is 19.

The spelling of 111111111001009 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, one thousand, nine".