123042205109 has 2 divisors, whose sum is σ = 123042205110. Its totient is φ = 123042205108.

The previous prime is 123042205081. The next prime is 123042205193. The reversal of 123042205109 is 901502240321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80133154084 + 42909051025 = 283078^2 + 207145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123042205109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123042205309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61521102554 + 61521102555.

It is an arithmetic number, because the mean of its divisors is an integer number (61521102555).

Almost surely, 2^123042205109 is an apocalyptic number.

It is an amenable number.

123042205109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123042205109 is an equidigital number, since it uses as much as digits as its factorization.

123042205109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 123042205109 in words is "one hundred twenty-three billion, forty-two million, two hundred five thousand, one hundred nine".