111011111001001 has 4 divisors (see below), whose sum is σ = 112110230912004. Its totient is φ = 109911991090000.

The previous prime is 111011111000971. The next prime is 111011111001013. The reversal of 111011111001001 is 100100111110111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56656632243600 + 54354478757401 = 7527060^2 + 7372549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111011111001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111011111001061) 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, 549559955350 + ... + 549559955551.

It is an arithmetic number, because the mean of its divisors is an integer number (28027557728001).

Almost surely, 2^{111011111001001} is an apocalyptic number.

It is an amenable number.

111011111001001 is a deficient number, since it is larger than the sum of its proper divisors (1099119911003).

111011111001001 is a wasteful number, since it uses less digits than its factorization.

111011111001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099119911002.

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

Adding to 111011111001001 its reverse (100100111110111), we get a palindrome (211111222111112).

The spelling of 111011111001001 in words is "one hundred eleven trillion, eleven billion, one hundred eleven million, one thousand, one".