820327909 has 2 divisors, whose sum is σ = 820327910. Its totient is φ = 820327908.

The previous prime is 820327883. The next prime is 820327919. The reversal of 820327909 is 909723028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 802872225 + 17455684 = 28335^2 + 4178^2 .

It is a cyclic number.

It is not a de Polignac number, because 820327909 - 2²³ = 811939301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820327919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410163954 + 410163955.

It is an arithmetic number, because the mean of its divisors is an integer number (410163955).

Almost surely, 2^820327909 is an apocalyptic number.

It is an amenable number.

820327909 is a deficient number, since it is larger than the sum of its proper divisors (1).

820327909 is an equidigital number, since it uses as much as digits as its factorization.

820327909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 820327909 is about 28641.3670937684. The cubic root of 820327909 is about 936.1149097515.

The spelling of 820327909 in words is "eight hundred twenty million, three hundred twenty-seven thousand, nine hundred nine".