123111113 has 2 divisors, whose sum is σ = 123111114. Its totient is φ = 123111112.

The previous prime is 123111091. The next prime is 123111167. The reversal of 123111113 is 311111321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116920969 + 6190144 = 10813^2 + 2488^2 .

It is a cyclic number.

It is not a de Polignac number, because 123111113 - 2⁸ = 123110857 is a prime.

It is a super-2 number, since 2×123111113² = 30312692288197538, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (123111613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61555556 + 61555557.

It is an arithmetic number, because the mean of its divisors is an integer number (61555557).

Almost surely, 2^123111113 is an apocalyptic number.

It is an amenable number.

123111113 is a deficient number, since it is larger than the sum of its proper divisors (1).

123111113 is an equidigital number, since it uses as much as digits as its factorization.

123111113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 14.

The square root of 123111113 is about 11095.5447365147. The cubic root of 123111113 is about 497.4686905711.

Adding to 123111113 its reverse (311111321), we get a palindrome (434222434).

The spelling of 123111113 in words is "one hundred twenty-three million, one hundred eleven thousand, one hundred thirteen".