655324221 has 8 divisors (see below), whose sum is σ = 901951744. Its totient is φ = 422789760.

The previous prime is 655324183. The next prime is 655324237. The reversal of 655324221 is 122423556.

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

It is not a de Polignac number, because 655324221 - 2⁹ = 655323709 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 (655324291) 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, 3523156 + ... + 3523341.

It is an arithmetic number, because the mean of its divisors is an integer number (112743968).

Almost surely, 2^655324221 is an apocalyptic number.

It is an amenable number.

655324221 is a deficient number, since it is larger than the sum of its proper divisors (246627523).

655324221 is a wasteful number, since it uses less digits than its factorization.

655324221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7046531.

The product of its digits is 14400, while the sum is 30.

The square root of 655324221 is about 25599.3011818682. The cubic root of 655324221 is about 868.5978298697.

Adding to 655324221 its reverse (122423556), we get a palindrome (777747777).

The spelling of 655324221 in words is "six hundred fifty-five million, three hundred twenty-four thousand, two hundred twenty-one".