133912217 has 2 divisors, whose sum is σ = 133912218. Its totient is φ = 133912216.

The previous prime is 133912199. The next prime is 133912231. The reversal of 133912217 is 712219331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95335696 + 38576521 = 9764^2 + 6211^2 .

It is an emirp because it is prime and its reverse (712219331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133912217 - 2⁶ = 133912153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133912217.

It is not a weakly prime, because it can be changed into another prime (133912237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66956108 + 66956109.

It is an arithmetic number, because the mean of its divisors is an integer number (66956109).

Almost surely, 2^133912217 is an apocalyptic number.

It is an amenable number.

133912217 is a deficient number, since it is larger than the sum of its proper divisors (1).

133912217 is an equidigital number, since it uses as much as digits as its factorization.

133912217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 133912217 is about 11572.0446335123. The cubic root of 133912217 is about 511.6112275461.

The spelling of 133912217 in words is "one hundred thirty-three million, nine hundred twelve thousand, two hundred seventeen".