12003661 has 4 divisors (see below), whose sum is σ = 12095424. Its totient is φ = 11911900.

The previous prime is 12003647. The next prime is 12003671. The reversal of 12003661 is 16630021.

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.

It is a cyclic number.

It is not a de Polignac number, because 12003661 - 2¹³ = 11995469 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 (12003601) 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, 45685 + ... + 45946.

It is an arithmetic number, because the mean of its divisors is an integer number (3023856).

Almost surely, 2^12003661 is an apocalyptic number.

It is an amenable number.

12003661 is a deficient number, since it is larger than the sum of its proper divisors (91763).

12003661 is an equidigital number, since it uses as much as digits as its factorization.

12003661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91762.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 12003661 is about 3464.6299946748. The cubic root of 12003661 is about 228.9661283592.

Adding to 12003661 its reverse (16630021), we get a palindrome (28633682).

The spelling of 12003661 in words is "twelve million, three thousand, six hundred sixty-one".