12109831 has 16 divisors (see below), whose sum is σ = 13271040. Its totient is φ = 11007360.

The previous prime is 12109817. The next prime is 12109843. The reversal of 12109831 is 13890121.

12109831 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12109831 - 2⁹ = 12109319 is a prime.

It is a super-2 number, since 2×12109831² = 293296013697122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 12109796 and 12109805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95290 + ... + 95416.

It is an arithmetic number, because the mean of its divisors is an integer number (829440).

Almost surely, 2^12109831 is an apocalyptic number.

12109831 is a deficient number, since it is larger than the sum of its proper divisors (1161209).

12109831 is a wasteful number, since it uses less digits than its factorization.

12109831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 12109831 is about 3479.9182461661. The cubic root of 12109831 is about 229.6392011699.

Adding to 12109831 its reverse (13890121), we get a palindrome (25999952).

The spelling of 12109831 in words is "twelve million, one hundred nine thousand, eight hundred thirty-one".