111111101001001 has 8 divisors (see below), whose sum is σ = 113094763766784. Its totient is φ = 109144762801200.

The previous prime is 111111101000981. The next prime is 111111101001023. The reversal of 111111101001001 is 100100101111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111111101001001 - 2¹⁵ = 111111100968233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111101001031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4331128555 + ... + 4331154208.

It is an arithmetic number, because the mean of its divisors is an integer number (14136845470848).

Almost surely, 2^{111111101001001} is an apocalyptic number.

It is an amenable number.

111111101001001 is a deficient number, since it is larger than the sum of its proper divisors (1983662765783).

111111101001001 is a wasteful number, since it uses less digits than its factorization.

111111101001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8662282991.

The product of its (nonzero) digits is 1, while the sum is 10.

Adding to 111111101001001 its reverse (100100101111111), we get a palindrome (211211202112112).

The spelling of 111111101001001 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred one million, one thousand, one".