8522723821 has 4 divisors (see below), whose sum is σ = 8536020444. Its totient is φ = 8509427200.

The previous prime is 8522723813. The next prime is 8522723827. The reversal of 8522723821 is 1283272258.

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 7406495721 + 1116228100 = 86061^2 + 33410^2 .

It is a cyclic number.

It is not a de Polignac number, because 8522723821 - 2³ = 8522723813 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 (8522723827) 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, 6647350 + ... + 6648631.

It is an arithmetic number, because the mean of its divisors is an integer number (2134005111).

Almost surely, 2^8522723821 is an apocalyptic number.

It is an amenable number.

8522723821 is a deficient number, since it is larger than the sum of its proper divisors (13296623).

8522723821 is a wasteful number, since it uses less digits than its factorization.

8522723821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13296622.

The product of its digits is 107520, while the sum is 40.

The square root of 8522723821 is about 92318.5995398544. The cubic root of 8522723821 is about 2042.6445758492.

The spelling of 8522723821 in words is "eight billion, five hundred twenty-two million, seven hundred twenty-three thousand, eight hundred twenty-one".