123081635909 has 2 divisors, whose sum is σ = 123081635910. Its totient is φ = 123081635908.

The previous prime is 123081635891. The next prime is 123081635923. The reversal of 123081635909 is 909536180321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98213292100 + 24868343809 = 313390^2 + 157697^2 .

It is a cyclic number.

It is not a de Polignac number, because 123081635909 - 2⁸ = 123081635653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123081605909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61540817954 + 61540817955.

It is an arithmetic number, because the mean of its divisors is an integer number (61540817955).

Almost surely, 2^123081635909 is an apocalyptic number.

It is an amenable number.

123081635909 is a deficient number, since it is larger than the sum of its proper divisors (1).

123081635909 is an equidigital number, since it uses as much as digits as its factorization.

123081635909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 123081635909 in words is "one hundred twenty-three billion, eighty-one million, six hundred thirty-five thousand, nine hundred nine".