Adding to 133667 its reverse (766331), we get a palindrome (899998).
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 766331 = 41 ⋅18691.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-133667 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a plaindrome in base 10.
2133667 is an apocalyptic number.
133667 is an equidigital number, since it uses as much as digits as its factorization.
133667 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 732.
The square root of 133667 is about 365.6049780843. The cubic root of 133667 is about 51.1298753130.
The spelling of 133667 in words is "one hundred thirty-three thousand, six hundred sixty-seven".