131006809 has 2 divisors, whose sum is σ = 131006810. Its totient is φ = 131006808.

The previous prime is 131006803. The next prime is 131006851. The reversal of 131006809 is 908600131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 51796809 = 8900^2 + 7197^2 .

It is a cyclic number.

It is not a de Polignac number, because 131006809 - 2³ = 131006801 is a prime.

It is not a weakly prime, because it can be changed into another prime (131006801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65503404 + 65503405.

It is an arithmetic number, because the mean of its divisors is an integer number (65503405).

Almost surely, 2^131006809 is an apocalyptic number.

It is an amenable number.

131006809 is a deficient number, since it is larger than the sum of its proper divisors (1).

131006809 is an equidigital number, since it uses as much as digits as its factorization.

131006809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 131006809 is about 11445.8205909406. The cubic root of 131006809 is about 507.8841069559.

The spelling of 131006809 in words is "one hundred thirty-one million, six thousand, eight hundred nine".