131731189 has 4 divisors (see below), whose sum is σ = 137458656. Its totient is φ = 126003724.

The previous prime is 131731163. The next prime is 131731207. The reversal of 131731189 is 981137131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981137131 = 13 ⋅75472087.

It is a cyclic number.

It is not a de Polignac number, because 131731189 - 2¹⁵ = 131698421 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 (131731139) 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, 2863699 + ... + 2863744.

It is an arithmetic number, because the mean of its divisors is an integer number (34364664).

Almost surely, 2^131731189 is an apocalyptic number.

It is an amenable number.

131731189 is a deficient number, since it is larger than the sum of its proper divisors (5727467).

131731189 is an equidigital number, since it uses as much as digits as its factorization.

131731189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5727466.

The product of its digits is 4536, while the sum is 34.

The square root of 131731189 is about 11477.4208339679. The cubic root of 131731189 is about 508.8184733583.

The spelling of 131731189 in words is "one hundred thirty-one million, seven hundred thirty-one thousand, one hundred eighty-nine".