131320517 has 2 divisors, whose sum is σ = 131320518. Its totient is φ = 131320516.

The previous prime is 131320513. The next prime is 131320523. The reversal of 131320517 is 715023131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127215841 + 4104676 = 11279^2 + 2026^2 .

It is an emirp because it is prime and its reverse (715023131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131320517 - 2² = 131320513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131320492 and 131320501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131320513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65660258 + 65660259.

It is an arithmetic number, because the mean of its divisors is an integer number (65660259).

Almost surely, 2^131320517 is an apocalyptic number.

It is an amenable number.

131320517 is a deficient number, since it is larger than the sum of its proper divisors (1).

131320517 is an equidigital number, since it uses as much as digits as its factorization.

131320517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 131320517 is about 11459.5164383145. The cubic root of 131320517 is about 508.2891757277.

Adding to 131320517 its reverse (715023131), we get a palindrome (846343648).

The spelling of 131320517 in words is "one hundred thirty-one million, three hundred twenty thousand, five hundred seventeen".