12243661 has 2 divisors, whose sum is σ = 12243662. Its totient is φ = 12243660.

The previous prime is 12243611. The next prime is 12243701. The reversal of 12243661 is 16634221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11594025 + 649636 = 3405^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 12243661 - 2¹¹ = 12241613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12243601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6121830 + 6121831.

It is an arithmetic number, because the mean of its divisors is an integer number (6121831).

Almost surely, 2^12243661 is an apocalyptic number.

It is an amenable number.

12243661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12243661 is an equidigital number, since it uses as much as digits as its factorization.

12243661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 12243661 is about 3499.0943113897. The cubic root of 12243661 is about 230.4820450815.

Adding to 12243661 its reverse (16634221), we get a palindrome (28877882).

The spelling of 12243661 in words is "twelve million, two hundred forty-three thousand, six hundred sixty-one".