111123031121 has 2 divisors, whose sum is σ = 111123031122. Its totient is φ = 111123031120.

The previous prime is 111123031109. The next prime is 111123031127. The reversal of 111123031121 is 121130321111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111081557521 + 41473600 = 333289^2 + 6440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111123031121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111123031121.

It is not a weakly prime, because it can be changed into another prime (111123031127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561515560 + 55561515561.

It is an arithmetic number, because the mean of its divisors is an integer number (55561515561).

Almost surely, 2^111123031121 is an apocalyptic number.

It is an amenable number.

111123031121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111123031121 is an equidigital number, since it uses as much as digits as its factorization.

111123031121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 111123031121 its reverse (121130321111), we get a palindrome (232253352232).

The spelling of 111123031121 in words is "one hundred eleven billion, one hundred twenty-three million, thirty-one thousand, one hundred twenty-one".