581228221 has 16 divisors (see below), whose sum is σ = 705654400. Its totient is φ = 467633088.

The previous prime is 581228213. The next prime is 581228243. The reversal of 581228221 is 122822185.

It is a cyclic number.

It is not a de Polignac number, because 581228221 - 2³ = 581228213 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 (581228621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5550 + ... + 34543.

It is an arithmetic number, because the mean of its divisors is an integer number (44103400).

Almost surely, 2^581228221 is an apocalyptic number.

It is an amenable number.

581228221 is a deficient number, since it is larger than the sum of its proper divisors (124426179).

581228221 is a wasteful number, since it uses less digits than its factorization.

581228221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40228.

The product of its digits is 5120, while the sum is 31.

The square root of 581228221 is about 24108.6752228321. The cubic root of 581228221 is about 834.5433438347.

The spelling of 581228221 in words is "five hundred eighty-one million, two hundred twenty-eight thousand, two hundred twenty-one".