56605221 has 6 divisors (see below), whose sum is σ = 81763110. Its totient is φ = 37736808.

The previous prime is 56605217. The next prime is 56605259. The reversal of 56605221 is 12250665.

56605221 is a `hidden beast` number, since 56 + 605 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 1028196 = 7455^2 + 1014^2 .

It is not a de Polignac number, because 56605221 - 2² = 56605217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56605271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3144726 + ... + 3144743.

It is an arithmetic number, because the mean of its divisors is an integer number (13627185).

Almost surely, 2^56605221 is an apocalyptic number.

It is an amenable number.

56605221 is a deficient number, since it is larger than the sum of its proper divisors (25157889).

56605221 is a wasteful number, since it uses less digits than its factorization.

56605221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289475 (or 6289472 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 56605221 is about 7523.6441303400. The cubic root of 56605221 is about 383.9595701250.

Adding to 56605221 its reverse (12250665), we get a palindrome (68855886).

The spelling of 56605221 in words is "fifty-six million, six hundred five thousand, two hundred twenty-one".