138481533 has 6 divisors (see below), whose sum is σ = 200028894. Its totient is φ = 92321016.

The previous prime is 138481531. The next prime is 138481573. The reversal of 138481533 is 335184831.

It can be written as a sum of positive squares in only one way, i.e., 88397604 + 50083929 = 9402^2 + 7077^2 .

It is not a de Polignac number, because 138481533 - 2¹ = 138481531 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138481531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7693410 + ... + 7693427.

It is an arithmetic number, because the mean of its divisors is an integer number (33338149).

Almost surely, 2^138481533 is an apocalyptic number.

It is an amenable number.

138481533 is a deficient number, since it is larger than the sum of its proper divisors (61547361).

138481533 is a wasteful number, since it uses less digits than its factorization.

138481533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15386843 (or 15386840 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 138481533 is about 11767.8176821363. The cubic root of 138481533 is about 517.3652887477.

It can be divided in two parts, 138 and 481533, that added together give a triangular number (481671 = T₉₈₁).

The spelling of 138481533 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, five hundred thirty-three".