817398871 has 4 divisors (see below), whose sum is σ = 822413752. Its totient is φ = 812383992.

The previous prime is 817398851. The next prime is 817398889. The reversal of 817398871 is 178893718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 817398871 - 2²¹ = 815301719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817398821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2507196 + ... + 2507521.

It is an arithmetic number, because the mean of its divisors is an integer number (205603438).

Almost surely, 2^817398871 is an apocalyptic number.

817398871 is a deficient number, since it is larger than the sum of its proper divisors (5014881).

817398871 is a wasteful number, since it uses less digits than its factorization.

817398871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5014880.

The product of its digits is 677376, while the sum is 52.

The square root of 817398871 is about 28590.1883694389. The cubic root of 817398871 is about 934.9994265393. Note that the first 3 decimals are identical.

The spelling of 817398871 in words is "eight hundred seventeen million, three hundred ninety-eight thousand, eight hundred seventy-one".