56545221 has 8 divisors (see below), whose sum is σ = 75505504. Its totient is φ = 37640880.

The previous prime is 56545217. The next prime is 56545259. The reversal of 56545221 is 12254565.

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

It is not a de Polignac number, because 56545221 - 2² = 56545217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56545211) 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 in 7 ways as a sum of consecutive naturals, for example, 11566 + ... + 15711.

It is an arithmetic number, because the mean of its divisors is an integer number (9438188).

Almost surely, 2^56545221 is an apocalyptic number.

It is an amenable number.

56545221 is a deficient number, since it is larger than the sum of its proper divisors (18960283).

56545221 is a wasteful number, since it uses less digits than its factorization.

56545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27971.

The product of its digits is 12000, while the sum is 30.

The square root of 56545221 is about 7519.6556437114. The cubic root of 56545221 is about 383.8238599182.

Adding to 56545221 its reverse (12254565), we get a palindrome (68799786).

The spelling of 56545221 in words is "fifty-six million, five hundred forty-five thousand, two hundred twenty-one".