111111023 has 2 divisors, whose sum is σ = 111111024. Its totient is φ = 111111022.

The previous prime is 111111019. The next prime is 111111041. The reversal of 111111023 is 320111111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111111023 - 2² = 111111019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111110995 and 111111013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555511 + 55555512.

It is an arithmetic number, because the mean of its divisors is an integer number (55555512).

Almost surely, 2^111111023 is an apocalyptic number.

111111023 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111023 is an equidigital number, since it uses as much as digits as its factorization.

111111023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 111111023 is about 10540.9213544168. The cubic root of 111111023 is about 480.7497296909.

Adding to 111111023 its reverse (320111111), we get a palindrome (431222134).

The spelling of 111111023 in words is "one hundred eleven million, one hundred eleven thousand, twenty-three".