264608221 has 4 divisors (see below), whose sum is σ = 264656700. Its totient is φ = 264559744.

The previous prime is 264608207. The next prime is 264608237. The reversal of 264608221 is 122806462.

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 150332121 + 114276100 = 12261^2 + 10690^2 .

It is a cyclic number.

It is not a de Polignac number, because 264608221 - 2¹³ = 264600029 is a prime.

It is a super-3 number, since 3×264608221³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264608251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14836 + ... + 27373.

It is an arithmetic number, because the mean of its divisors is an integer number (66164175).

Almost surely, 2^264608221 is an apocalyptic number.

It is an amenable number.

264608221 is a deficient number, since it is larger than the sum of its proper divisors (48479).

264608221 is an equidigital number, since it uses as much as digits as its factorization.

264608221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48478.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 264608221 is about 16266.7827489027. The cubic root of 264608221 is about 641.9991370737. Note that the first 3 decimals are identical.

The spelling of 264608221 in words is "two hundred sixty-four million, six hundred eight thousand, two hundred twenty-one".