123111012202117 has 2 divisors, whose sum is σ = 123111012202118. Its totient is φ = 123111012202116.

The previous prime is 123111012202103. The next prime is 123111012202141. The reversal of 123111012202117 is 711202210111321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115998091198081 + 7112921004036 = 10770241^2 + 2667006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123111012202117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123111012202091 and 123111012202100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123111012202517) 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 as a sum of consecutive naturals, namely, 61555506101058 + 61555506101059.

It is an arithmetic number, because the mean of its divisors is an integer number (61555506101059).

Almost surely, 2^{123111012202117} is an apocalyptic number.

It is an amenable number.

123111012202117 is a deficient number, since it is larger than the sum of its proper divisors (1).

123111012202117 is an equidigital number, since it uses as much as digits as its factorization.

123111012202117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 25.

Adding to 123111012202117 its reverse (711202210111321), we get a palindrome (834313222313438).

The spelling of 123111012202117 in words is "one hundred twenty-three trillion, one hundred eleven billion, twelve million, two hundred two thousand, one hundred seventeen".