52556221 has 4 divisors (see below), whose sum is σ = 52891132. Its totient is φ = 52221312.

The previous prime is 52556209. The next prime is 52556237. The reversal of 52556221 is 12265525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33292900 + 19263321 = 5770^2 + 4389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52556221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52556221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52556281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167220 + ... + 167533.

It is an arithmetic number, because the mean of its divisors is an integer number (13222783).

Almost surely, 2^52556221 is an apocalyptic number.

It is an amenable number.

52556221 is a deficient number, since it is larger than the sum of its proper divisors (334911).

52556221 is a wasteful number, since it uses less digits than its factorization.

52556221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334910.

The product of its digits is 6000, while the sum is 28.

The square root of 52556221 is about 7249.5669525841. The cubic root of 52556221 is about 374.5772325967.

It can be divided in two parts, 5255 and 6221, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 52556221 in words is "fifty-two million, five hundred fifty-six thousand, two hundred twenty-one".