12045661 has 2 divisors, whose sum is σ = 12045662. Its totient is φ = 12045660.

The previous prime is 12045653. The next prime is 12045689. The reversal of 12045661 is 16654021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 4761 = 3470^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 12045661 - 2³ = 12045653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12045611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6022830 + 6022831.

It is an arithmetic number, because the mean of its divisors is an integer number (6022831).

Almost surely, 2^12045661 is an apocalyptic number.

It is an amenable number.

12045661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12045661 is an equidigital number, since it uses as much as digits as its factorization.

12045661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 12045661 is about 3470.6859552544. The cubic root of 12045661 is about 229.2328631835.

Adding to 12045661 its reverse (16654021), we get a palindrome (28699682).

The spelling of 12045661 in words is "twelve million, forty-five thousand, six hundred sixty-one".