816822173 has 8 divisors (see below), whose sum is σ = 831942048. Its totient is φ = 801828144.

The previous prime is 816822151. The next prime is 816822191. The reversal of 816822173 is 371228618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 816822173 - 2¹² = 816818077 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 (816822133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18311 + ... + 44372.

It is an arithmetic number, because the mean of its divisors is an integer number (103992756).

Almost surely, 2^816822173 is an apocalyptic number.

816822173 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

816822173 is a deficient number, since it is larger than the sum of its proper divisors (15119875).

816822173 is a wasteful number, since it uses less digits than its factorization.

816822173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62923.

The product of its digits is 32256, while the sum is 38.

The square root of 816822173 is about 28580.1009970224. The cubic root of 816822173 is about 934.7794853014.

The spelling of 816822173 in words is "eight hundred sixteen million, eight hundred twenty-two thousand, one hundred seventy-three".