138687133 has 8 divisors (see below), whose sum is σ = 152998776. Its totient is φ = 124896000.

The previous prime is 138687127. The next prime is 138687163. The reversal of 138687133 is 331786831.

It can be written as a sum of positive squares in 4 ways, for example, as 1633284 + 137053849 = 1278^2 + 11707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138687133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138687103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129568 + ... + 130633.

It is an arithmetic number, because the mean of its divisors is an integer number (19124847).

Almost surely, 2^138687133 is an apocalyptic number.

138687133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138687133 is a deficient number, since it is larger than the sum of its proper divisors (14311643).

138687133 is a wasteful number, since it uses less digits than its factorization.

138687133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260255.

The product of its digits is 72576, while the sum is 40.

The square root of 138687133 is about 11776.5501315114. The cubic root of 138687133 is about 517.6212018231.

The spelling of 138687133 in words is "one hundred thirty-eight million, six hundred eighty-seven thousand, one hundred thirty-three".