12231665 has 4 divisors (see below), whose sum is σ = 14678004. Its totient is φ = 9785328.

The previous prime is 12231647. The next prime is 12231671. The reversal of 12231665 is 56613221.

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 9412624 + 2819041 = 3068^2 + 1679^2 .

It is a cyclic number.

It is not a de Polignac number, because 12231665 - 2¹² = 12227569 is a prime.

It is a super-2 number, since 2×12231665² = 299227257344450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223162 + ... + 1223171.

It is an arithmetic number, because the mean of its divisors is an integer number (3669501).

Almost surely, 2^12231665 is an apocalyptic number.

It is an amenable number.

12231665 is a deficient number, since it is larger than the sum of its proper divisors (2446339).

12231665 is an equidigital number, since it uses as much as digits as its factorization.

12231665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446338.

The product of its digits is 2160, while the sum is 26.

The square root of 12231665 is about 3497.3797334576. The cubic root of 12231665 is about 230.4067471761.

Adding to 12231665 its reverse (56613221), we get a palindrome (68844886).

The spelling of 12231665 in words is "twelve million, two hundred thirty-one thousand, six hundred sixty-five".