130731 has 4 divisors (see below), whose sum is σ = 174312. Its totient is φ = 87152.

The previous prime is 130729. The next prime is 130769. The reversal of 130731 is 137031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137031 = 3 ⋅45677.

It is a cyclic number.

It is not a de Polignac number, because 130731 - 2¹ = 130729 is a prime.

It is a super-2 number, since 2×130731² = 34181188722, which contains 22 as substring.

It is a D-number.

130731 is a lucky number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 130731.

It is not an unprimeable number, because it can be changed into a prime (130531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21786 + ... + 21791.

It is an arithmetic number, because the mean of its divisors is an integer number (43578).

2¹³⁰⁷³¹ is an apocalyptic number.

130731 is a deficient number, since it is larger than the sum of its proper divisors (43581).

130731 is an equidigital number, since it uses as much as digits as its factorization.

130731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43580.

The product of its (nonzero) digits is 63, while the sum is 15.

The square root of 130731 is about 361.5674210987. The cubic root of 130731 is about 50.7527439933.

Adding to 130731 its reverse (137031), we get a palindrome (267762).

It can be divided in two parts, 130 and 731, that added together give a triangular number (861 = T₄₁).

The spelling of 130731 in words is "one hundred thirty thousand, seven hundred thirty-one".