138331 has 4 divisors (see below), whose sum is σ = 141592. Its totient is φ = 135072.

The previous prime is 138323. The next prime is 138337. The reversal of 138331 is 133831.

138331 = T₈ + T₉ + ... + T₉₃.

138331 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 is a cyclic number.

It is not a de Polignac number, because 138331 - 2³ = 138323 is a prime.

It is a super-2 number, since 2×138331² = 38270931122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138299 and 138308.

It is not an unprimeable number, because it can be changed into a prime (138337) 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, 1566 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (35398).

2¹³⁸³³¹ is an apocalyptic number.

138331 is a deficient number, since it is larger than the sum of its proper divisors (3261).

138331 is an equidigital number, since it uses as much as digits as its factorization.

138331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260.

The product of its digits is 216, while the sum is 19.

The square root of 138331 is about 371.9287566188. The cubic root of 138331 is about 51.7177757641.

The spelling of 138331 in words is "one hundred thirty-eight thousand, three hundred thirty-one".