131440013 has 4 divisors (see below), whose sum is σ = 131464800. Its totient is φ = 131415228.

The previous prime is 131440007. The next prime is 131440019. The reversal of 131440013 is 310044131.

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: 310044131 = 181 ⋅1712951.

It is an interprime number because it is at equal distance from previous prime (131440007) and next prime (131440019).

It is a cyclic number.

It is not a de Polignac number, because 131440013 - 2⁸ = 131439757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131439973 and 131440000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131440019) 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, 863 + ... + 16236.

It is an arithmetic number, because the mean of its divisors is an integer number (32866200).

Almost surely, 2^131440013 is an apocalyptic number.

It is an amenable number.

131440013 is a deficient number, since it is larger than the sum of its proper divisors (24787).

131440013 is an equidigital number, since it uses as much as digits as its factorization.

131440013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24786.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 131440013 is about 11464.7290853295. The cubic root of 131440013 is about 508.4433027214.

Adding to 131440013 its reverse (310044131), we get a palindrome (441484144).

The spelling of 131440013 in words is "one hundred thirty-one million, four hundred forty thousand, thirteen".