133000138 has 4 divisors (see below), whose sum is σ = 199500210. Its totient is φ = 66500068.

The previous prime is 133000121. The next prime is 133000139. The reversal of 133000138 is 831000331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 88604569 + 44395569 = 9413^2 + 6663^2 .

It is not an unprimeable number, because it can be changed into a prime (133000139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250033 + ... + 33250036.

Almost surely, 2^133000138 is an apocalyptic number.

133000138 is a deficient number, since it is larger than the sum of its proper divisors (66500072).

133000138 is an equidigital number, since it uses as much as digits as its factorization.

133000138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66500071.

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

The square root of 133000138 is about 11532.5685777280. The cubic root of 133000138 is about 510.4470487456.

Adding to 133000138 its reverse (831000331), we get a palindrome (964000469).

The spelling of 133000138 in words is "one hundred thirty-three million, one hundred thirty-eight", and thus it is an aban number.