817999051489 has 9 divisors (see below), whose sum is σ = 830451735057. Its totient is φ = 805730417844.

The previous prime is 817999051459. The next prime is 817999051511. The reversal of 817999051489 is 984150999718.

The square root of 817999051489 is 904433.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 817999051489 - 2¹³ = 817999043297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817999051459) 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 in 8 ways as a sum of consecutive naturals, for example, 60590262 + ... + 60603760.

Almost surely, 2^817999051489 is an apocalyptic number.

817999051489 is the 904433-rd square number.

817999051489 is the 452217-th centered octagonal number.

It is an amenable number.

817999051489 is a deficient number, since it is larger than the sum of its proper divisors (12452683568).

817999051489 is an frugal number, since it uses more digits than its factorization.

817999051489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27132 (or 13566 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 70.

The spelling of 817999051489 in words is "eight hundred seventeen billion, nine hundred ninety-nine million, fifty-one thousand, four hundred eighty-nine".