111111123001 has 6 divisors (see below), whose sum is σ = 112200355770. Its totient is φ = 110032363728.

The previous prime is 111111122933. The next prime is 111111123107. The reversal of 111111123001 is 100321111111.

It can be written as a sum of positive squares in only one way, i.e., 108636160000 + 2474963001 = 329600^2 + 49749^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111111123001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111129001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5226036 + ... + 5247253.

It is an arithmetic number, because the mean of its divisors is an integer number (18700059295).

Almost surely, 2^111111123001 is an apocalyptic number.

It is an amenable number.

111111123001 is a deficient number, since it is larger than the sum of its proper divisors (1089232769).

111111123001 is an equidigital number, since it uses as much as digits as its factorization.

111111123001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473495 (or 10473392 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 111111123001 its reverse (100321111111), we get a palindrome (211432234112).

The spelling of 111111123001 in words is "one hundred eleven billion, one hundred eleven million, one hundred twenty-three thousand, one".