32215661 has 2 divisors, whose sum is σ = 32215662. Its totient is φ = 32215660.

The previous prime is 32215639. The next prime is 32215669. The reversal of 32215661 is 16651223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25060036 + 7155625 = 5006^2 + 2675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32215661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 32215661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32215669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16107830 + 16107831.

It is an arithmetic number, because the mean of its divisors is an integer number (16107831).

Almost surely, 2^32215661 is an apocalyptic number.

It is an amenable number.

32215661 is a deficient number, since it is larger than the sum of its proper divisors (1).

32215661 is an equidigital number, since it uses as much as digits as its factorization.

32215661 is an odious number, because the sum of its binary digits is odd.

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

The square root of 32215661 is about 5675.8841601992. The cubic root of 32215661 is about 318.1918235345.

Adding to 32215661 its reverse (16651223), we get a palindrome (48866884).

The spelling of 32215661 in words is "thirty-two million, two hundred fifteen thousand, six hundred sixty-one".