131281239 has 4 divisors (see below), whose sum is σ = 175041656. Its totient is φ = 87520824.

The previous prime is 131281219. The next prime is 131281243. The reversal of 131281239 is 932182131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131281239 - 2¹³ = 131273047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131281219) 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, 21880204 + ... + 21880209.

It is an arithmetic number, because the mean of its divisors is an integer number (43760414).

Almost surely, 2^131281239 is an apocalyptic number.

131281239 is a deficient number, since it is larger than the sum of its proper divisors (43760417).

131281239 is an equidigital number, since it uses as much as digits as its factorization.

131281239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43760416.

The product of its digits is 2592, while the sum is 30.

The square root of 131281239 is about 11457.8025380088. The cubic root of 131281239 is about 508.2384942005.

The spelling of 131281239 in words is "one hundred thirty-one million, two hundred eighty-one thousand, two hundred thirty-nine".