111011011001001 has 64 divisors (see below), whose sum is σ = 173098884096000. Its totient is φ = 70220328736320.

The previous prime is 111011011000997. The next prime is 111011011001027. The reversal of 111011011001001 is 100100110110111.

It is not a de Polignac number, because 111011011001001 - 2² = 111011011000997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (111011011001701) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15750511 + ... + 21681803.

It is an arithmetic number, because the mean of its divisors is an integer number (2704670064000).

Almost surely, 2^{111011011001001} is an apocalyptic number.

It is an amenable number.

111011011001001 is a deficient number, since it is larger than the sum of its proper divisors (62087873094999).

111011011001001 is a wasteful number, since it uses less digits than its factorization.

111011011001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931771 (or 5931765 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 111011011001001 its reverse (100100110110111), we get a palindrome (211111121111112).

The spelling of 111011011001001 in words is "one hundred eleven trillion, eleven billion, eleven million, one thousand, one".