500555221 has 2 divisors, whose sum is σ = 500555222. Its totient is φ = 500555220.

The previous prime is 500555213. The next prime is 500555243. The reversal of 500555221 is 122555005.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497914596 + 2640625 = 22314^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 500555221 - 2³ = 500555213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (500555261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250277610 + 250277611.

It is an arithmetic number, because the mean of its divisors is an integer number (250277611).

Almost surely, 2^500555221 is an apocalyptic number.

It is an amenable number.

500555221 is a deficient number, since it is larger than the sum of its proper divisors (1).

500555221 is an equidigital number, since it uses as much as digits as its factorization.

500555221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 500555221 is about 22373.0914493281. The cubic root of 500555221 is about 793.9942034401.

The spelling of 500555221 in words is "five hundred million, five hundred fifty-five thousand, two hundred twenty-one".