128712131123 has 8 divisors (see below), whose sum is σ = 129976236000. Its totient is φ = 127448304768.

The previous prime is 128712131117. The next prime is 128712131131. The reversal of 128712131123 is 321131217821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128712131123 - 2²⁴ = 128695353907 is a prime.

It is a super-2 number, since 2×128712131123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128712131123.

It is not an unprimeable number, because it can be changed into a prime (128712131173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929093 + ... + 1058601.

It is an arithmetic number, because the mean of its divisors is an integer number (16247029500).

Almost surely, 2^128712131123 is an apocalyptic number.

128712131123 is a deficient number, since it is larger than the sum of its proper divisors (1264104877).

128712131123 is a wasteful number, since it uses less digits than its factorization.

128712131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139261.

The product of its digits is 4032, while the sum is 32.

Adding to 128712131123 its reverse (321131217821), we get a palindrome (449843348944).

The spelling of 128712131123 in words is "one hundred twenty-eight billion, seven hundred twelve million, one hundred thirty-one thousand, one hundred twenty-three".