818200993 has 4 divisors (see below), whose sum is σ = 820154160. Its totient is φ = 816247828.

The previous prime is 818200987. The next prime is 818201023. The reversal of 818200993 is 399002818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818200993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818200913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975955 + ... + 976792.

It is an arithmetic number, because the mean of its divisors is an integer number (205038540).

Almost surely, 2^818200993 is an apocalyptic number.

It is an amenable number.

818200993 is a deficient number, since it is larger than the sum of its proper divisors (1953167).

818200993 is a wasteful number, since it uses less digits than its factorization.

818200993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953166.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 818200993 is about 28604.2128540535. The cubic root of 818200993 is about 935.3051681008.

The spelling of 818200993 in words is "eight hundred eighteen million, two hundred thousand, nine hundred ninety-three".