12144661 has 4 divisors (see below), whose sum is σ = 12153024. Its totient is φ = 12136300.

The previous prime is 12144637. The next prime is 12144677. The reversal of 12144661 is 16644121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16644121 = 13 ⋅1280317.

It is a cyclic number.

It is not a de Polignac number, because 12144661 - 2¹⁵ = 12111893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12144631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1375 + ... + 5116.

It is an arithmetic number, because the mean of its divisors is an integer number (3038256).

Almost surely, 2^12144661 is an apocalyptic number.

It is an amenable number.

12144661 is a deficient number, since it is larger than the sum of its proper divisors (8363).

12144661 is an equidigital number, since it uses as much as digits as its factorization.

12144661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362.

The product of its digits is 1152, while the sum is 25.

The square root of 12144661 is about 3484.9190808396. The cubic root of 12144661 is about 229.8591513190.

Adding to 12144661 its reverse (16644121), we get a palindrome (28788782).

The spelling of 12144661 in words is "twelve million, one hundred forty-four thousand, six hundred sixty-one".