809328257 has 2 divisors, whose sum is σ = 809328258. Its totient is φ = 809328256.

The previous prime is 809328229. The next prime is 809328271. The reversal of 809328257 is 752823908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776792641 + 32535616 = 27871^2 + 5704^2 .

It is a cyclic number.

It is not a de Polignac number, because 809328257 - 2⁸ = 809328001 is a prime.

It is not a weakly prime, because it can be changed into another prime (809328227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404664128 + 404664129.

It is an arithmetic number, because the mean of its divisors is an integer number (404664129).

Almost surely, 2^809328257 is an apocalyptic number.

It is an amenable number.

809328257 is a deficient number, since it is larger than the sum of its proper divisors (1).

809328257 is an equidigital number, since it uses as much as digits as its factorization.

809328257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 809328257 is about 28448.6951721867. The cubic root of 809328257 is about 931.9119938913.

The spelling of 809328257 in words is "eight hundred nine million, three hundred twenty-eight thousand, two hundred fifty-seven".