138184521331 has 4 divisors (see below), whose sum is σ = 138202380064. Its totient is φ = 138166662600.

The previous prime is 138184521271. The next prime is 138184521361. The reversal of 138184521331 is 133125481831.

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

It is a cyclic number.

It is not a de Polignac number, because 138184521331 - 2⁹ = 138184520819 is a prime.

It is a super-2 number, since 2×138184521331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138184521361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8917755 + ... + 8933236.

It is an arithmetic number, because the mean of its divisors is an integer number (34550595016).

Almost surely, 2^138184521331 is an apocalyptic number.

138184521331 is a deficient number, since it is larger than the sum of its proper divisors (17858733).

138184521331 is an equidigital number, since it uses as much as digits as its factorization.

138184521331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17858732.

The product of its digits is 69120, while the sum is 40.

The spelling of 138184521331 in words is "one hundred thirty-eight billion, one hundred eighty-four million, five hundred twenty-one thousand, three hundred thirty-one".