123423516109 has 2 divisors, whose sum is σ = 123423516110. Its totient is φ = 123423516108.

The previous prime is 123423516071. The next prime is 123423516133. The reversal of 123423516109 is 901615324321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76994040484 + 46429475625 = 277478^2 + 215475^2 .

It is an emirp because it is prime and its reverse (901615324321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123423516109 - 2⁷ = 123423515981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123423516149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61711758054 + 61711758055.

It is an arithmetic number, because the mean of its divisors is an integer number (61711758055).

Almost surely, 2^123423516109 is an apocalyptic number.

It is an amenable number.

123423516109 is a deficient number, since it is larger than the sum of its proper divisors (1).

123423516109 is an equidigital number, since it uses as much as digits as its factorization.

123423516109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 123423516109 in words is "one hundred twenty-three billion, four hundred twenty-three million, five hundred sixteen thousand, one hundred nine".