131384609 has 2 divisors, whose sum is σ = 131384610. Its totient is φ = 131384608.

The previous prime is 131384581. The next prime is 131384611. The reversal of 131384609 is 906483131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 60403984 = 8425^2 + 7772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131384609 is a prime.

It is a Sophie Germain prime.

Together with 131384611, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131384689) 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, 65692304 + 65692305.

It is an arithmetic number, because the mean of its divisors is an integer number (65692305).

Almost surely, 2^131384609 is an apocalyptic number.

It is an amenable number.

131384609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131384609 is an equidigital number, since it uses as much as digits as its factorization.

131384609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 131384609 is about 11462.3125502666. The cubic root of 131384609 is about 508.3718537742.

The spelling of 131384609 in words is "one hundred thirty-one million, three hundred eighty-four thousand, six hundred nine".