111123031109 has 2 divisors, whose sum is σ = 111123031110. Its totient is φ = 111123031108.

The previous prime is 111123031093. The next prime is 111123031121. The reversal of 111123031109 is 901130321111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100300790209 + 10822240900 = 316703^2 + 104030^2 .

It is an emirp because it is prime and its reverse (901130321111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111123031109 - 2⁴ = 111123031093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111123031189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561515554 + 55561515555.

It is an arithmetic number, because the mean of its divisors is an integer number (55561515555).

Almost surely, 2^111123031109 is an apocalyptic number.

It is an amenable number.

111123031109 is a deficient number, since it is larger than the sum of its proper divisors (1).

111123031109 is an equidigital number, since it uses as much as digits as its factorization.

111123031109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 111123031109 in words is "one hundred eleven billion, one hundred twenty-three million, thirty-one thousand, one hundred nine".