131239439 has 4 divisors (see below), whose sum is σ = 138959424. Its totient is φ = 123519456.

The previous prime is 131239417. The next prime is 131239447. The reversal of 131239439 is 934932131.

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 131239439 - 2¹² = 131235343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131239399 and 131239408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131239499) 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, 3859967 + ... + 3860000.

It is an arithmetic number, because the mean of its divisors is an integer number (34739856).

Almost surely, 2^131239439 is an apocalyptic number.

131239439 is a deficient number, since it is larger than the sum of its proper divisors (7719985).

131239439 is an equidigital number, since it uses as much as digits as its factorization.

131239439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7719984.

The product of its digits is 17496, while the sum is 35.

The square root of 131239439 is about 11455.9783082895. The cubic root of 131239439 is about 508.1845473600.

The spelling of 131239439 in words is "one hundred thirty-one million, two hundred thirty-nine thousand, four hundred thirty-nine".