123112515112 has 8 divisors (see below), whose sum is σ = 230835965850. Its totient is φ = 61556257552.

The previous prime is 123112515061. The next prime is 123112515181. The reversal of 123112515112 is 211515211321.

It can be written as a sum of positive squares in only one way, i.e., 92935961316 + 30176553796 = 304854^2 + 173714^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 7694532187 + ... + 7694532202.

Almost surely, 2^123112515112 is an apocalyptic number.

It is an amenable number.

123112515112 is a deficient number, since it is larger than the sum of its proper divisors (107723450738).

123112515112 is a wasteful number, since it uses less digits than its factorization.

123112515112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15389064395 (or 15389064391 counting only the distinct ones).

The product of its digits is 600, while the sum is 25.

Adding to 123112515112 its reverse (211515211321), we get a palindrome (334627726433).

The spelling of 123112515112 in words is "one hundred twenty-three billion, one hundred twelve million, five hundred fifteen thousand, one hundred twelve".