12031081 has 4 divisors (see below), whose sum is σ = 12324564. Its totient is φ = 11737600.

The previous prime is 12031079. The next prime is 12031111. The reversal of 12031081 is 18013021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3031081 + 9000000 = 1741^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031081 - 2¹ = 12031079 is a prime.

It is a super-2 number, since 2×12031081² = 289493820057122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031051) 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, 146680 + ... + 146761.

It is an arithmetic number, because the mean of its divisors is an integer number (3081141).

Almost surely, 2^12031081 is an apocalyptic number.

It is an amenable number.

12031081 is a deficient number, since it is larger than the sum of its proper divisors (293483).

12031081 is an equidigital number, since it uses as much as digits as its factorization.

12031081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293482.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 12031081 is about 3468.5848699434. The cubic root of 12031081 is about 229.1403384556.

The spelling of 12031081 in words is "twelve million, thirty-one thousand, eighty-one".