123112321209 has 12 divisors (see below), whose sum is σ = 177839169300. Its totient is φ = 82070145024.

The previous prime is 123112321159. The next prime is 123112321223. The reversal of 123112321209 is 902123211321.

123112321209 is a `hidden beast` number, since 1 + 2 + 311 + 2 + 321 + 20 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 72453565584 + 50658755625 = 269172^2 + 225075^2 .

It is not a de Polignac number, because 123112321209 - 2⁹ = 123112320697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123112321229) 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 in 11 ways as a sum of consecutive naturals, for example, 226224 + ... + 545345.

It is an arithmetic number, because the mean of its divisors is an integer number (14819930775).

Almost surely, 2^123112321209 is an apocalyptic number.

It is an amenable number.

123112321209 is a deficient number, since it is larger than the sum of its proper divisors (54726848091).

123112321209 is a wasteful number, since it uses less digits than its factorization.

123112321209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789304 (or 789301 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The spelling of 123112321209 in words is "one hundred twenty-three billion, one hundred twelve million, three hundred twenty-one thousand, two hundred nine".