556753221 has 6 divisors (see below), whose sum is σ = 804199110. Its totient is φ = 371168808.

The previous prime is 556753217. The next prime is 556753229. The reversal of 556753221 is 122357655.

556753221 is a `hidden beast` number, since 556 + 75 + 32 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 511392996 + 45360225 = 22614^2 + 6735^2 .

It is not a de Polignac number, because 556753221 - 2² = 556753217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556753229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30930726 + ... + 30930743.

It is an arithmetic number, because the mean of its divisors is an integer number (134033185).

Almost surely, 2^556753221 is an apocalyptic number.

It is an amenable number.

556753221 is a deficient number, since it is larger than the sum of its proper divisors (247445889).

556753221 is a wasteful number, since it uses less digits than its factorization.

556753221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61861475 (or 61861472 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 556753221 is about 23595.6186822893. The cubic root of 556753221 is about 822.6610068423.

The spelling of 556753221 in words is "five hundred fifty-six million, seven hundred fifty-three thousand, two hundred twenty-one".