355559221 has 2 divisors, whose sum is σ = 355559222. Its totient is φ = 355559220.

The previous prime is 355559203. The next prime is 355559261. The reversal of 355559221 is 122955553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338044996 + 17514225 = 18386^2 + 4185^2 .

It is a cyclic number.

It is not a de Polignac number, because 355559221 - 2⁵ = 355559189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (355559201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177779610 + 177779611.

It is an arithmetic number, because the mean of its divisors is an integer number (177779611).

Almost surely, 2^355559221 is an apocalyptic number.

It is an amenable number.

355559221 is a deficient number, since it is larger than the sum of its proper divisors (1).

355559221 is an equidigital number, since it uses as much as digits as its factorization.

355559221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67500, while the sum is 37.

The square root of 355559221 is about 18856.2780261641. The cubic root of 355559221 is about 708.4414805608.

The spelling of 355559221 in words is "three hundred fifty-five million, five hundred fifty-nine thousand, two hundred twenty-one".