123980803909 has 2 divisors, whose sum is σ = 123980803910. Its totient is φ = 123980803908.

The previous prime is 123980803907. The next prime is 123980803957. The reversal of 123980803909 is 909308089321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92182068225 + 31798735684 = 303615^2 + 178322^2 .

It is a cyclic number.

It is not a de Polignac number, because 123980803909 - 2¹ = 123980803907 is a prime.

Together with 123980803907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123980803907) 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, 61990401954 + 61990401955.

It is an arithmetic number, because the mean of its divisors is an integer number (61990401955).

Almost surely, 2^123980803909 is an apocalyptic number.

It is an amenable number.

123980803909 is a deficient number, since it is larger than the sum of its proper divisors (1).

123980803909 is an equidigital number, since it uses as much as digits as its factorization.

123980803909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 123980803909 in words is "one hundred twenty-three billion, nine hundred eighty million, eight hundred three thousand, nine hundred nine".