131321151809 has 2 divisors, whose sum is σ = 131321151810. Its totient is φ = 131321151808.

The previous prime is 131321151691. The next prime is 131321151821. The reversal of 131321151809 is 908151123131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129530169409 + 1790982400 = 359903^2 + 42320^2 .

It is a cyclic number.

It is not a de Polignac number, because 131321151809 - 2⁸ = 131321151553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131321151839) 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 as a sum of consecutive naturals, namely, 65660575904 + 65660575905.

It is an arithmetic number, because the mean of its divisors is an integer number (65660575905).

Almost surely, 2^131321151809 is an apocalyptic number.

It is an amenable number.

131321151809 is a deficient number, since it is larger than the sum of its proper divisors (1).

131321151809 is an equidigital number, since it uses as much as digits as its factorization.

131321151809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 131321151809 in words is "one hundred thirty-one billion, three hundred twenty-one million, one hundred fifty-one thousand, eight hundred nine".