111111110001 has 24 divisors (see below), whose sum is σ = 164854913600. Its totient is φ = 72061832736.

The previous prime is 111111109997. The next prime is 111111110009. The reversal of 111111110001 is 100011111111.

It is not a de Polignac number, because 111111110001 - 2² = 111111109997 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111110009) 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, 2844066 + ... + 2882868.

Almost surely, 2^111111110001 is an apocalyptic number.

It is an amenable number.

111111110001 is a deficient number, since it is larger than the sum of its proper divisors (53743803599).

111111110001 is a wasteful number, since it uses less digits than its factorization.

111111110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47445 (or 47442 counting only the distinct ones).

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

Adding to 111111110001 its reverse (100011111111), we get a palindrome (211122221112).

It can be divided in two parts, 1111111 and 10001, that multiplied together give a palindrome (11112221111).

The spelling of 111111110001 in words is "one hundred eleven billion, one hundred eleven million, one hundred ten thousand, one".