52215661 has 2 divisors, whose sum is σ = 52215662. Its totient is φ = 52215660.

The previous prime is 52215643. The next prime is 52215671. The reversal of 52215661 is 16651225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31147561 + 21068100 = 5581^2 + 4590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52215661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52215641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26107830 + 26107831.

It is an arithmetic number, because the mean of its divisors is an integer number (26107831).

Almost surely, 2^52215661 is an apocalyptic number.

It is an amenable number.

52215661 is a deficient number, since it is larger than the sum of its proper divisors (1).

52215661 is an equidigital number, since it uses as much as digits as its factorization.

52215661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 52215661 is about 7226.0404787131. The cubic root of 52215661 is about 373.7664021168.

Adding to 52215661 its reverse (16651225), we get a palindrome (68866886).

The spelling of 52215661 in words is "fifty-two million, two hundred fifteen thousand, six hundred sixty-one".