133123138 has 4 divisors (see below), whose sum is σ = 199684710. Its totient is φ = 66561568.

The previous prime is 133123099. The next prime is 133123157. The reversal of 133123138 is 831321331.

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., 109474369 + 23648769 = 10463^2 + 4863^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280783 + ... + 33280786.

Almost surely, 2^133123138 is an apocalyptic number.

133123138 is a deficient number, since it is larger than the sum of its proper divisors (66561572).

133123138 is an equidigital number, since it uses as much as digits as its factorization.

133123138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66561571.

The product of its digits is 1296, while the sum is 25.

The square root of 133123138 is about 11537.9000689034. The cubic root of 133123138 is about 510.6043559563.

Adding to 133123138 its reverse (831321331), we get a palindrome (964444469).

The spelling of 133123138 in words is "one hundred thirty-three million, one hundred twenty-three thousand, one hundred thirty-eight".