131945239 has 4 divisors (see below), whose sum is σ = 132010200. Its totient is φ = 131880280.

The previous prime is 131945221. The next prime is 131945267. The reversal of 131945239 is 932549131.

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 131945239 - 2¹⁷ = 131814167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131945198 and 131945207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131945039) 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, 29332 + ... + 33529.

It is an arithmetic number, because the mean of its divisors is an integer number (33002550).

Almost surely, 2^131945239 is an apocalyptic number.

131945239 is a deficient number, since it is larger than the sum of its proper divisors (64961).

131945239 is an equidigital number, since it uses as much as digits as its factorization.

131945239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64960.

The product of its digits is 29160, while the sum is 37.

The square root of 131945239 is about 11486.7418792275. The cubic root of 131945239 is about 509.0939172567.

The spelling of 131945239 in words is "one hundred thirty-one million, nine hundred forty-five thousand, two hundred thirty-nine".