133205 has 4 divisors (see below), whose sum is σ = 159852. Its totient is φ = 106560.
The previous prime is 133201. The next prime is 133213. The reversal of 133205 is 502331.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502331 = 103 ⋅4877.
It can be written as a sum of positive squares in 2 ways, for example, as 24964 + 108241 = 158^2 + 329^2 .
It is not a de Polignac number, because 133205 - 22 = 133201 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is a plaindrome in base 14.
It is a self number, because there is not a number n which added to its sum of digits gives 133205.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (133201) 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, 13316 + ... + 13325.
It is an arithmetic number, because the mean of its divisors is an integer number (39963).
2133205 is an apocalyptic number.
It is an amenable number.
133205 is a deficient number, since it is larger than the sum of its proper divisors (26647).
133205 is an equidigital number, since it uses as much as digits as its factorization.
133205 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 26646.
The product of its (nonzero) digits is 90, while the sum is 14.
The square root of 133205 is about 364.9726017114. The cubic root of 133205 is about 51.0708997242.
Adding to 133205 its reverse (502331), we get a palindrome (635536).
The spelling of 133205 in words is "one hundred thirty-three thousand, two hundred five".
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