133697217 has 8 divisors (see below), whose sum is σ = 181626624. Its totient is φ = 87449648.

The previous prime is 133697209. The next prime is 133697233. The reversal of 133697217 is 712796331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133697217 - 2³ = 133697209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133697287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420273 + ... + 420590.

It is an arithmetic number, because the mean of its divisors is an integer number (22703328).

Almost surely, 2^133697217 is an apocalyptic number.

It is an amenable number.

133697217 is a deficient number, since it is larger than the sum of its proper divisors (47929407).

133697217 is an equidigital number, since it uses as much as digits as its factorization.

133697217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840919.

The product of its digits is 47628, while the sum is 39.

The square root of 133697217 is about 11562.7512729454. The cubic root of 133697217 is about 511.3372785955.

The spelling of 133697217 in words is "one hundred thirty-three million, six hundred ninety-seven thousand, two hundred seventeen".