816501893 has 8 divisors (see below), whose sum is σ = 832116480. Its totient is φ = 801019440.

The previous prime is 816501883. The next prime is 816501949. The reversal of 816501893 is 398105618.

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 816501893 - 2²⁸ = 548066437 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 816501893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816501853) 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 7 ways as a sum of consecutive naturals, for example, 20513 + ... + 45318.

It is an arithmetic number, because the mean of its divisors is an integer number (104014560).

Almost surely, 2^816501893 is an apocalyptic number.

It is an amenable number.

816501893 is a deficient number, since it is larger than the sum of its proper divisors (15614587).

816501893 is a wasteful number, since it uses less digits than its factorization.

816501893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66067.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 816501893 is about 28574.4972484207. The cubic root of 816501893 is about 934.6572921146.

The spelling of 816501893 in words is "eight hundred sixteen million, five hundred one thousand, eight hundred ninety-three".