355605221 has 8 divisors (see below), whose sum is σ = 368167800. Its totient is φ = 343062720.

The previous prime is 355605209. The next prime is 355605223. The reversal of 355605221 is 122506553.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20349121 + 335256100 = 4511^2 + 18310^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-355605221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355605223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37151 + ... + 45731.

It is an arithmetic number, because the mean of its divisors is an integer number (46020975).

Almost surely, 2^355605221 is an apocalyptic number.

It is an amenable number.

355605221 is a deficient number, since it is larger than the sum of its proper divisors (12562579).

355605221 is a wasteful number, since it uses less digits than its factorization.

355605221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10039.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 355605221 is about 18857.4977396260. The cubic root of 355605221 is about 708.4720304673.

The spelling of 355605221 in words is "three hundred fifty-five million, six hundred five thousand, two hundred twenty-one".