131310209 has 2 divisors, whose sum is σ = 131310210. Its totient is φ = 131310208.

The previous prime is 131310199. The next prime is 131310211. The reversal of 131310209 is 902013131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107329600 + 23980609 = 10360^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 131310209 - 2⁸ = 131309953 is a prime.

Together with 131310211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131310239) 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 as a sum of consecutive naturals, namely, 65655104 + 65655105.

It is an arithmetic number, because the mean of its divisors is an integer number (65655105).

Almost surely, 2^131310209 is an apocalyptic number.

It is an amenable number.

131310209 is a deficient number, since it is larger than the sum of its proper divisors (1).

131310209 is an equidigital number, since it uses as much as digits as its factorization.

131310209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 131310209 is about 11459.0666722905. The cubic root of 131310209 is about 508.2758759986.

The spelling of 131310209 in words is "one hundred thirty-one million, three hundred ten thousand, two hundred nine".