123000031128 has 32 divisors (see below), whose sum is σ = 331153930800. Its totient is φ = 37846163328.

The previous prime is 123000031127. The next prime is 123000031139. The reversal of 123000031128 is 821130000321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123000031127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197115123 + ... + 197115746.

Almost surely, 2^123000031128 is an apocalyptic number.

It is an amenable number.

123000031128 is an abundant number, since it is smaller than the sum of its proper divisors (208153899672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123000031128 is a wasteful number, since it uses less digits than its factorization.

123000031128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394230891 (or 394230887 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 123000031128 its reverse (821130000321), we get a palindrome (944130031449).

The spelling of 123000031128 in words is "one hundred twenty-three billion, thirty-one thousand, one hundred twenty-eight".