133197217 has 2 divisors, whose sum is σ = 133197218. Its totient is φ = 133197216.

The previous prime is 133197179. The next prime is 133197223. The reversal of 133197217 is 712791331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117483921 + 15713296 = 10839^2 + 3964^2 .

It is a cyclic number.

It is not a de Polignac number, because 133197217 - 2¹¹ = 133195169 is a prime.

It is not a weakly prime, because it can be changed into another prime (133197247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66598608 + 66598609.

It is an arithmetic number, because the mean of its divisors is an integer number (66598609).

Almost surely, 2^133197217 is an apocalyptic number.

It is an amenable number.

133197217 is a deficient number, since it is larger than the sum of its proper divisors (1).

133197217 is an equidigital number, since it uses as much as digits as its factorization.

133197217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 34.

The square root of 133197217 is about 11541.1098686392. The cubic root of 133197217 is about 510.6990503539.

The spelling of 133197217 in words is "one hundred thirty-three million, one hundred ninety-seven thousand, two hundred seventeen".