809081129 has 2 divisors, whose sum is σ = 809081130. Its totient is φ = 809081128.

The previous prime is 809081089. The next prime is 809081137. The reversal of 809081129 is 921180908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720815104 + 88266025 = 26848^2 + 9395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809081129 is a prime.

It is a super-2 number, since 2×809081129² = 1309224546607829282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 809081092 and 809081101.

It is not a weakly prime, because it can be changed into another prime (809081149) 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, 404540564 + 404540565.

It is an arithmetic number, because the mean of its divisors is an integer number (404540565).

Almost surely, 2^809081129 is an apocalyptic number.

It is an amenable number.

809081129 is a deficient number, since it is larger than the sum of its proper divisors (1).

809081129 is an equidigital number, since it uses as much as digits as its factorization.

809081129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 809081129 is about 28444.3514427733. The cubic root of 809081129 is about 931.8171312732.

The spelling of 809081129 in words is "eight hundred nine million, eighty-one thousand, one hundred twenty-nine".