133512217 has 4 divisors (see below), whose sum is σ = 139317120. Its totient is φ = 127707316.

The previous prime is 133512199. The next prime is 133512233. The reversal of 133512217 is 712215331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712215331 = 37 ⋅19249063.

It is not a de Polignac number, because 133512217 - 2⁷ = 133512089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133512191 and 133512200.

It is not an unprimeable number, because it can be changed into a prime (133512017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2902417 + ... + 2902462.

It is an arithmetic number, because the mean of its divisors is an integer number (34829280).

Almost surely, 2^133512217 is an apocalyptic number.

It is an amenable number.

133512217 is a deficient number, since it is larger than the sum of its proper divisors (5804903).

133512217 is an equidigital number, since it uses as much as digits as its factorization.

133512217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5804902.

The product of its digits is 1260, while the sum is 25.

The square root of 133512217 is about 11554.7486774919. The cubic root of 133512217 is about 511.1013199010.

Adding to 133512217 its reverse (712215331), we get a palindrome (845727548).

The spelling of 133512217 in words is "one hundred thirty-three million, five hundred twelve thousand, two hundred seventeen".