111111010001001 has 24 divisors (see below), whose sum is σ = 162818717218560. Its totient is φ = 73001740795200.

The previous prime is 111111010000997. The next prime is 111111010001059. The reversal of 111111010001001 is 100100010111111.

It is not a de Polignac number, because 111111010001001 - 2² = 111111010000997 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 (111111010002001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32875921 + ... + 36097758.

It is an arithmetic number, because the mean of its divisors is an integer number (6784113217440).

Almost surely, 2^{111111010001001} is an apocalyptic number.

It is an amenable number.

111111010001001 is a deficient number, since it is larger than the sum of its proper divisors (51707707217559).

111111010001001 is a wasteful number, since it uses less digits than its factorization.

111111010001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68976277 (or 68976274 counting only the distinct ones).

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

Adding to 111111010001001 its reverse (100100010111111), we get a palindrome (211211020112112).

The spelling of 111111010001001 in words is "one hundred eleven trillion, one hundred eleven billion, ten million, one thousand, one".