131239 has 4 divisors (see below), whose sum is σ = 134824. Its totient is φ = 127656.

The previous prime is 131231. The next prime is 131249. The reversal of 131239 is 932131.

131239 is nontrivially palindromic in base 13.

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 131239 - 2³ = 131231 is a prime.

It is a d-powerful number, because it can be written as 1 + 3 + 2¹⁷ + 1 + 3⁴ + 9² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231) 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, 1737 + ... + 1810.

It is an arithmetic number, because the mean of its divisors is an integer number (33706).

2¹³¹²³⁹ is an apocalyptic number.

131239 is a deficient number, since it is larger than the sum of its proper divisors (3585).

131239 is an equidigital number, since it uses as much as digits as its factorization.

131239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584.

The product of its digits is 162, while the sum is 19.

The square root of 131239 is about 362.2692368943. The cubic root of 131239 is about 50.8183980728.

The spelling of 131239 in words is "one hundred thirty-one thousand, two hundred thirty-nine".