366135221 has 2 divisors, whose sum is σ = 366135222. Its totient is φ = 366135220.

The previous prime is 366135197. The next prime is 366135257. The reversal of 366135221 is 122531663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212722225 + 153412996 = 14585^2 + 12386^2 .

It is a cyclic number.

It is not a de Polignac number, because 366135221 - 2⁶ = 366135157 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366135271) 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 as a sum of consecutive naturals, namely, 183067610 + 183067611.

It is an arithmetic number, because the mean of its divisors is an integer number (183067611).

Almost surely, 2^366135221 is an apocalyptic number.

It is an amenable number.

366135221 is a deficient number, since it is larger than the sum of its proper divisors (1).

366135221 is an equidigital number, since it uses as much as digits as its factorization.

366135221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 366135221 is about 19134.6602007979. The cubic root of 366135221 is about 715.3970904605.

Adding to 366135221 its reverse (122531663), we get a palindrome (488666884).

The spelling of 366135221 in words is "three hundred sixty-six million, one hundred thirty-five thousand, two hundred twenty-one".