817312669 has 2 divisors, whose sum is σ = 817312670. Its totient is φ = 817312668.

The previous prime is 817312651. The next prime is 817312681. The reversal of 817312669 is 966213718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817216569 + 96100 = 28587^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 817312669 - 2⁹ = 817312157 is a prime.

It is a super-2 number, since 2×817312669² = 1335999997815807122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817312609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408656334 + 408656335.

It is an arithmetic number, because the mean of its divisors is an integer number (408656335).

Almost surely, 2^817312669 is an apocalyptic number.

It is an amenable number.

817312669 is a deficient number, since it is larger than the sum of its proper divisors (1).

817312669 is an equidigital number, since it uses as much as digits as its factorization.

817312669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 817312669 is about 28588.6807845343. The cubic root of 817312669 is about 934.9665573748.

The spelling of 817312669 in words is "eight hundred seventeen million, three hundred twelve thousand, six hundred sixty-nine".