131320009 has 2 divisors, whose sum is σ = 131320010. Its totient is φ = 131320008.

The previous prime is 131319997. The next prime is 131320031. The reversal of 131320009 is 900023131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121616784 + 9703225 = 11028^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 131320009 - 2⁵ = 131319977 is a prime.

It is not a weakly prime, because it can be changed into another prime (131320069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65660004 + 65660005.

It is an arithmetic number, because the mean of its divisors is an integer number (65660005).

Almost surely, 2^131320009 is an apocalyptic number.

It is an amenable number.

131320009 is a deficient number, since it is larger than the sum of its proper divisors (1).

131320009 is an equidigital number, since it uses as much as digits as its factorization.

131320009 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 19.

The square root of 131320009 is about 11459.4942733089. The cubic root of 131320009 is about 508.2885203053.

The spelling of 131320009 in words is "one hundred thirty-one million, three hundred twenty thousand, nine".