6823498721 has 4 divisors (see below), whose sum is σ = 7348383252. Its totient is φ = 6298614192.

The previous prime is 6823498667. The next prime is 6823498729. The reversal of 6823498721 is 1278943286.

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 1576090000 + 5247408721 = 39700^2 + 72439^2 .

It is not a de Polignac number, because 6823498721 - 2¹⁰ = 6823497697 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 6823498721.

It is not an unprimeable number, because it can be changed into a prime (6823498729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262442246 + ... + 262442271.

It is an arithmetic number, because the mean of its divisors is an integer number (1837095813).

Almost surely, 2^6823498721 is an apocalyptic number.

It is an amenable number.

6823498721 is a deficient number, since it is larger than the sum of its proper divisors (524884531).

6823498721 is a wasteful number, since it uses less digits than its factorization.

6823498721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524884530.

The product of its digits is 1161216, while the sum is 50.

The square root of 6823498721 is about 82604.4715557215. The cubic root of 6823498721 is about 1896.7162783276.

The spelling of 6823498721 in words is "six billion, eight hundred twenty-three million, four hundred ninety-eight thousand, seven hundred twenty-one".