123112013309 has 2 divisors, whose sum is σ = 123112013310. Its totient is φ = 123112013308.

The previous prime is 123112013303. The next prime is 123112013351. The reversal of 123112013309 is 903310211321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97646875225 + 25465138084 = 312485^2 + 159578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123112013309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123112013303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61556006654 + 61556006655.

It is an arithmetic number, because the mean of its divisors is an integer number (61556006655).

Almost surely, 2^123112013309 is an apocalyptic number.

It is an amenable number.

123112013309 is a deficient number, since it is larger than the sum of its proper divisors (1).

123112013309 is an equidigital number, since it uses as much as digits as its factorization.

123112013309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 123112013309 in words is "one hundred twenty-three billion, one hundred twelve million, thirteen thousand, three hundred nine".