133138 has 4 divisors (see below), whose sum is σ = 199710. Its totient is φ = 66568.

The previous prime is 133121. The next prime is 133153. The reversal of 133138 is 831331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831331 = 101 ⋅8231.

It can be written as a sum of positive squares in only one way, i.e., 131769 + 1369 = 363^2 + 37^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283 + ... + 33286.

2¹³³¹³⁸ is an apocalyptic number.

133138 is a deficient number, since it is larger than the sum of its proper divisors (66572).

133138 is an equidigital number, since it uses as much as digits as its factorization.

133138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66571.

The product of its digits is 216, while the sum is 19.

The square root of 133138 is about 364.8808024547. The cubic root of 133138 is about 51.0623356709.

Adding to 133138 its reverse (831331), we get a palindrome (964469).

It can be divided in two parts, 1331 and 38, that added together give a square (1369 = 37²).

The spelling of 133138 in words is "one hundred thirty-three thousand, one hundred thirty-eight".