131731 has 2 divisors, whose sum is σ = 131732. Its totient is φ = 131730.

The previous prime is 131713. The next prime is 131743. The reversal of 131731 is 137131.

It is a happy number.

Together with previous prime (131713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (137131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131731 - 2¹⁵ = 98963 is a prime.

It is a super-2 number, since 2×131731² = 34706112722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65865 + 65866.

It is an arithmetic number, because the mean of its divisors is an integer number (65866).

2¹³¹⁷³¹ is an apocalyptic number.

131731 is a deficient number, since it is larger than the sum of its proper divisors (1).

131731 is an equidigital number, since it uses as much as digits as its factorization.

131731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63, while the sum is 16.

The square root of 131731 is about 362.9476546280. The cubic root of 131731 is about 50.8818230017.

Adding to 131731 its reverse (137131), we get a palindrome (268862).

The spelling of 131731 in words is "one hundred thirty-one thousand, seven hundred thirty-one".