131718 has 16 divisors (see below), whose sum is σ = 272880. Its totient is φ = 42336.

The previous prime is 131713. The next prime is 131731. The reversal of 131718 is 817131.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131694 and 131703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131711) by changing a digit.

131718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205 + ... + 552.

It is an arithmetic number, because the mean of its divisors is an integer number (17055).

2¹³¹⁷¹⁸ is an apocalyptic number.

131718 is an abundant number, since it is smaller than the sum of its proper divisors (141162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131718 is a wasteful number, since it uses less digits than its factorization.

131718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791.

The product of its digits is 168, while the sum is 21.

The square root of 131718 is about 362.9297452676. The cubic root of 131718 is about 50.8801491729.

Adding to 131718 its reverse (817131), we get a palindrome (948849).

The spelling of 131718 in words is "one hundred thirty-one thousand, seven hundred eighteen".