111001023 has 30 divisors (see below), whose sum is σ = 192895296. Its totient is φ = 63426888.

The previous prime is 111001019. The next prime is 111001081. The reversal of 111001023 is 320100111.

It is not a de Polignac number, because 111001023 - 2² = 111001019 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 111000996 and 111001014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001003) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 10015 + ... + 17952.

Almost surely, 2^111001023 is an apocalyptic number.

111001023 is a deficient number, since it is larger than the sum of its proper divisors (81894273).

111001023 is an equidigital number, since it uses as much as digits as its factorization.

111001023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27993 (or 27977 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 111001023 is about 10535.7023021724. The cubic root of 111001023 is about 480.5910297717.

Adding to 111001023 its reverse (320100111), we get a palindrome (431101134).

The spelling of 111001023 in words is "one hundred eleven million, one thousand, twenty-three".