123111102013 has 4 divisors (see below), whose sum is σ = 123112923228. Its totient is φ = 123109280800.

The previous prime is 123111101989. The next prime is 123111102017. The reversal of 123111102013 is 310201111321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6678648729 + 116432453284 = 81723^2 + 341222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123111102013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111102017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805138 + ... + 945763.

It is an arithmetic number, because the mean of its divisors is an integer number (30778230807).

Almost surely, 2^123111102013 is an apocalyptic number.

It is an amenable number.

123111102013 is a deficient number, since it is larger than the sum of its proper divisors (1821215).

123111102013 is an equidigital number, since it uses as much as digits as its factorization.

123111102013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821214.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 123111102013 its reverse (310201111321), we get a palindrome (433312213334).

The spelling of 123111102013 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred two thousand, thirteen".