12009931 has 4 divisors (see below), whose sum is σ = 12021192. Its totient is φ = 11998672.

The previous prime is 12009923. The next prime is 12009937. The reversal of 12009931 is 13990021.

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 12009931 - 2³ = 12009923 is a prime.

It is a super-2 number, since 2×12009931² = 288476885249522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12009896 and 12009905.

It is not an unprimeable number, because it can be changed into a prime (12009937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3841 + ... + 6226.

It is an arithmetic number, because the mean of its divisors is an integer number (3005298).

Almost surely, 2^12009931 is an apocalyptic number.

12009931 is a deficient number, since it is larger than the sum of its proper divisors (11261).

12009931 is a wasteful number, since it uses less digits than its factorization.

12009931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11260.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 12009931 is about 3465.5347350734. The cubic root of 12009931 is about 229.0059875248.

Adding to 12009931 its reverse (13990021), we get a palindrome (25999952).

The spelling of 12009931 in words is "twelve million, nine thousand, nine hundred thirty-one".