133365217 has 2 divisors, whose sum is σ = 133365218. Its totient is φ = 133365216.

The previous prime is 133365209. The next prime is 133365227. The reversal of 133365217 is 712563331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75620416 + 57744801 = 8696^2 + 7599^2 .

It is a cyclic number.

It is not a de Polignac number, because 133365217 - 2³ = 133365209 is a prime.

It is a super-2 number, since 2×133365217² = 35572562210914178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133365227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66682608 + 66682609.

It is an arithmetic number, because the mean of its divisors is an integer number (66682609).

Almost surely, 2^133365217 is an apocalyptic number.

It is an amenable number.

133365217 is a deficient number, since it is larger than the sum of its proper divisors (1).

133365217 is an equidigital number, since it uses as much as digits as its factorization.

133365217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 31.

The square root of 133365217 is about 11548.3859045323. The cubic root of 133365217 is about 510.9136729411.

The spelling of 133365217 in words is "one hundred thirty-three million, three hundred sixty-five thousand, two hundred seventeen".