655341221 has 4 divisors (see below), whose sum is σ = 664318572. Its totient is φ = 646363872.

The previous prime is 655341173. The next prime is 655341229. The reversal of 655341221 is 122143556.

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 148596100 + 506745121 = 12190^2 + 22511^2 .

It is a cyclic number.

It is not a de Polignac number, because 655341221 - 2⁶ = 655341157 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 (655341229) 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 3 ways as a sum of consecutive naturals, for example, 4488566 + ... + 4488711.

It is an arithmetic number, because the mean of its divisors is an integer number (166079643).

Almost surely, 2^655341221 is an apocalyptic number.

It is an amenable number.

655341221 is a deficient number, since it is larger than the sum of its proper divisors (8977351).

655341221 is an equidigital number, since it uses as much as digits as its factorization.

655341221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8977350.

The product of its digits is 7200, while the sum is 29.

The square root of 655341221 is about 25599.6332200288. The cubic root of 655341221 is about 868.6053406738.

Adding to 655341221 its reverse (122143556), we get a palindrome (777484777).

It can be divided in two parts, 6553 and 41221, that added together give a palindrome (47774).

The spelling of 655341221 in words is "six hundred fifty-five million, three hundred forty-one thousand, two hundred twenty-one".