123979193213 has 2 divisors, whose sum is σ = 123979193214. Its totient is φ = 123979193212.

The previous prime is 123979193209. The next prime is 123979193237. The reversal of 123979193213 is 312391979321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96872205049 + 27106988164 = 311243^2 + 164642^2 .

It is a cyclic number.

It is not a de Polignac number, because 123979193213 - 2² = 123979193209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123979192213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61989596606 + 61989596607.

It is an arithmetic number, because the mean of its divisors is an integer number (61989596607).

Almost surely, 2^123979193213 is an apocalyptic number.

It is an amenable number.

123979193213 is a deficient number, since it is larger than the sum of its proper divisors (1).

123979193213 is an equidigital number, since it uses as much as digits as its factorization.

123979193213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 50.

The spelling of 123979193213 in words is "one hundred twenty-three billion, nine hundred seventy-nine million, one hundred ninety-three thousand, two hundred thirteen".