138223133 has 4 divisors (see below), whose sum is σ = 140489148. Its totient is φ = 135957120.

The previous prime is 138223121. The next prime is 138223153. The reversal of 138223133 is 331322831.

138223133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35545444 + 102677689 = 5962^2 + 10133^2 .

It is a cyclic number.

It is not a de Polignac number, because 138223133 - 2¹⁴ = 138206749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138223103) 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, 1132916 + ... + 1133037.

It is an arithmetic number, because the mean of its divisors is an integer number (35122287).

Almost surely, 2^138223133 is an apocalyptic number.

It is an amenable number.

138223133 is a deficient number, since it is larger than the sum of its proper divisors (2266015).

138223133 is an equidigital number, since it uses as much as digits as its factorization.

138223133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266014.

The product of its digits is 2592, while the sum is 26.

The square root of 138223133 is about 11756.8334597374. The cubic root of 138223133 is about 517.0432953253.

Adding to 138223133 its reverse (331322831), we get a palindrome (469545964).

The spelling of 138223133 in words is "one hundred thirty-eight million, two hundred twenty-three thousand, one hundred thirty-three".