56601221 has 2 divisors, whose sum is σ = 56601222. Its totient is φ = 56601220.

The previous prime is 56601203. The next prime is 56601227. The reversal of 56601221 is 12210665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50908225 + 5692996 = 7135^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 56601221 - 2¹⁸ = 56339077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56601227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28300610 + 28300611.

It is an arithmetic number, because the mean of its divisors is an integer number (28300611).

Almost surely, 2^56601221 is an apocalyptic number.

It is an amenable number.

56601221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56601221 is an equidigital number, since it uses as much as digits as its factorization.

56601221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 56601221 is about 7523.3782970152. The cubic root of 56601221 is about 383.9505257622.

Adding to 56601221 its reverse (12210665), we get a palindrome (68811886).

The spelling of 56601221 in words is "fifty-six million, six hundred one thousand, two hundred twenty-one".