817214684389 has 2 divisors, whose sum is σ = 817214684390. Its totient is φ = 817214684388.

The previous prime is 817214684353. The next prime is 817214684437. The reversal of 817214684389 is 983486412718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631309702500 + 185904981889 = 794550^2 + 431167^2 .

It is a cyclic number.

It is not a de Polignac number, because 817214684389 - 2³³ = 808624749797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817214684309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408607342194 + 408607342195.

It is an arithmetic number, because the mean of its divisors is an integer number (408607342195).

Almost surely, 2^817214684389 is an apocalyptic number.

It is an amenable number.

817214684389 is a deficient number, since it is larger than the sum of its proper divisors (1).

817214684389 is an equidigital number, since it uses as much as digits as its factorization.

817214684389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18579456, while the sum is 61.

The spelling of 817214684389 in words is "eight hundred seventeen billion, two hundred fourteen million, six hundred eighty-four thousand, three hundred eighty-nine".