123101120123209 has 2 divisors, whose sum is σ = 123101120123210. Its totient is φ = 123101120123208.

The previous prime is 123101120123203. The next prime is 123101120123287. The reversal of 123101120123209 is 902321021101321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100341350804809 + 22759769318400 = 10017053^2 + 4770720^2 .

It is an emirp because it is prime and its reverse (902321021101321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123101120123209 is a prime.

It is not a weakly prime, because it can be changed into another prime (123101120123203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61550560061604 + 61550560061605.

It is an arithmetic number, because the mean of its divisors is an integer number (61550560061605).

Almost surely, 2^{123101120123209} is an apocalyptic number.

It is an amenable number.

123101120123209 is a deficient number, since it is larger than the sum of its proper divisors (1).

123101120123209 is an equidigital number, since it uses as much as digits as its factorization.

123101120123209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 123101120123209 in words is "one hundred twenty-three trillion, one hundred one billion, one hundred twenty million, one hundred twenty-three thousand, two hundred nine".