12231091 has 4 divisors (see below), whose sum is σ = 12239752. Its totient is φ = 12222432.

The previous prime is 12231083. The next prime is 12231133. The reversal of 12231091 is 19013221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12231091 - 2³ = 12231083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12231001) 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, 1665 + ... + 5218.

It is an arithmetic number, because the mean of its divisors is an integer number (3059938).

Almost surely, 2^12231091 is an apocalyptic number.

12231091 is a deficient number, since it is larger than the sum of its proper divisors (8661).

12231091 is an equidigital number, since it uses as much as digits as its factorization.

12231091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8660.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 12231091 is about 3497.2976710598. The cubic root of 12231091 is about 230.4031429914.

It can be divided in two parts, 122 and 31091, that added together give a palindrome (31213).

The spelling of 12231091 in words is "twelve million, two hundred thirty-one thousand, ninety-one".