56550221 has 8 divisors (see below), whose sum is σ = 69600384. Its totient is φ = 44742960.

The previous prime is 56550209. The next prime is 56550257. The reversal of 56550221 is 12205565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56550221 - 2¹⁰ = 56549197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56550271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310625 + ... + 310806.

It is an arithmetic number, because the mean of its divisors is an integer number (8700048).

Almost surely, 2^56550221 is an apocalyptic number.

It is an amenable number.

56550221 is a deficient number, since it is larger than the sum of its proper divisors (13050163).

56550221 is a wasteful number, since it uses less digits than its factorization.

56550221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621451.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 56550221 is about 7519.9880983948. The cubic root of 56550221 is about 383.8351727677.

Adding to 56550221 its reverse (12205565), we get a palindrome (68755786).

The spelling of 56550221 in words is "fifty-six million, five hundred fifty thousand, two hundred twenty-one".