12123655631 has 4 divisors (see below), whose sum is σ = 12124076664. Its totient is φ = 12123234600.

The previous prime is 12123655627. The next prime is 12123655637. The reversal of 12123655631 is 13655632121.

12123655631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12123655631 - 2² = 12123655627 is a prime.

It is a super-2 number, since 2×12123655631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123655591 and 12123655600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123655637) 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 3 ways as a sum of consecutive naturals, for example, 163880 + ... + 226061.

It is an arithmetic number, because the mean of its divisors is an integer number (3031019166).

Almost surely, 2^12123655631 is an apocalyptic number.

12123655631 is a deficient number, since it is larger than the sum of its proper divisors (421033).

12123655631 is an equidigital number, since it uses as much as digits as its factorization.

12123655631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421032.

The product of its digits is 32400, while the sum is 35.

The spelling of 12123655631 in words is "twelve billion, one hundred twenty-three million, six hundred fifty-five thousand, six hundred thirty-one".