139331 has 4 divisors (see below), whose sum is σ = 140112. Its totient is φ = 138552.

The previous prime is 139313. The next prime is 139333. The reversal of 139331 is 133931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 139331 - 2⁶ = 139267 is a prime.

It is a super-2 number, since 2×139331² = 38826255122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26 + ... + 528.

It is an arithmetic number, because the mean of its divisors is an integer number (35028).

2¹³⁹³³¹ is an apocalyptic number.

139331 is a deficient number, since it is larger than the sum of its proper divisors (781).

139331 is an equidigital number, since it uses as much as digits as its factorization.

139331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its digits is 243, while the sum is 20.

The square root of 139331 is about 373.2706792664. The cubic root of 139331 is about 51.8420999108.

The spelling of 139331 in words is "one hundred thirty-nine thousand, three hundred thirty-one".