12128031 has 12 divisors (see below), whose sum is σ = 17552808. Its totient is φ = 8069424.

The previous prime is 12128027. The next prime is 12128059. The reversal of 12128031 is 13082121.

It is not a de Polignac number, because 12128031 - 2² = 12128027 is a prime.

It is a super-2 number, since 2×12128031² = 294178271873922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12127995 and 12128013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5161 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (1462734).

Almost surely, 2^12128031 is an apocalyptic number.

12128031 is a deficient number, since it is larger than the sum of its proper divisors (5424777).

12128031 is a wasteful number, since it uses less digits than its factorization.

12128031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662 (or 2659 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12128031 is about 3482.5322683358. The cubic root of 12128031 is about 229.7541860236.

The spelling of 12128031 in words is "twelve million, one hundred twenty-eight thousand, thirty-one".