828491317 has 2 divisors, whose sum is σ = 828491318. Its totient is φ = 828491316.

The previous prime is 828491239. The next prime is 828491329. The reversal of 828491317 is 713194828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817902801 + 10588516 = 28599^2 + 3254^2 .

It is a cyclic number.

It is not a de Polignac number, because 828491317 - 2²³ = 820102709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (828491017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414245658 + 414245659.

It is an arithmetic number, because the mean of its divisors is an integer number (414245659).

Almost surely, 2^828491317 is an apocalyptic number.

It is an amenable number.

828491317 is a deficient number, since it is larger than the sum of its proper divisors (1).

828491317 is an equidigital number, since it uses as much as digits as its factorization.

828491317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 828491317 is about 28783.5250968327. The cubic root of 828491317 is about 939.2098826801.

The spelling of 828491317 in words is "eight hundred twenty-eight million, four hundred ninety-one thousand, three hundred seventeen".