8494338821 has 4 divisors (see below), whose sum is σ = 8494724172. Its totient is φ = 8493953472.

The previous prime is 8494338803. The next prime is 8494338823. The reversal of 8494338821 is 1288334948.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8417145025 + 77193796 = 91745^2 + 8786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8494338821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8494338821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8494338823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157466 + ... + 204411.

It is an arithmetic number, because the mean of its divisors is an integer number (2123681043).

Almost surely, 2^8494338821 is an apocalyptic number.

It is an amenable number.

8494338821 is a deficient number, since it is larger than the sum of its proper divisors (385351).

8494338821 is a wasteful number, since it uses less digits than its factorization.

8494338821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385350.

The product of its digits is 1327104, while the sum is 50.

The square root of 8494338821 is about 92164.7374053656. The cubic root of 8494338821 is about 2040.3743722928.

The spelling of 8494338821 in words is "eight billion, four hundred ninety-four million, three hundred thirty-eight thousand, eight hundred twenty-one".