56535221 has 2 divisors, whose sum is σ = 56535222. Its totient is φ = 56535220.

The previous prime is 56535197. The next prime is 56535247. The reversal of 56535221 is 12253565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45711121 + 10824100 = 6761^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 56535221 - 2²² = 52340917 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 (56535121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28267610 + 28267611.

It is an arithmetic number, because the mean of its divisors is an integer number (28267611).

Almost surely, 2^56535221 is an apocalyptic number.

It is an amenable number.

56535221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56535221 is an equidigital number, since it uses as much as digits as its factorization.

56535221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 29.

The square root of 56535221 is about 7518.9906902456. The cubic root of 56535221 is about 383.8012322182.

Adding to 56535221 its reverse (12253565), we get a palindrome (68788786).

The spelling of 56535221 in words is "fifty-six million, five hundred thirty-five thousand, two hundred twenty-one".