8452779721 has 3 divisors (see below), whose sum is σ = 8452871661. Its totient is φ = 8452687782.

The previous prime is 8452779691. The next prime is 8452779773. The reversal of 8452779721 is 1279772548.

The square root of 8452779721 is 91939.

It is a perfect power (a square), and thus also a powerful number.

8452779721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 8452779721 - 2¹¹ = 8452777673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8452779421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45970 + ... + 137908.

It is an arithmetic number, because the mean of its divisors is an integer number (2817623887).

Almost surely, 2^8452779721 is an apocalyptic number.

8452779721 is the 91939-th square number.

8452779721 is the 45970-th centered octagonal number.

It is an amenable number.

8452779721 is a deficient number, since it is larger than the sum of its proper divisors (91940).

8452779721 is an frugal number, since it uses more digits than its factorization.

8452779721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183878 (or 91939 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 52.

The cubic root of 8452779721 is about 2037.0413763746.

The spelling of 8452779721 in words is "eight billion, four hundred fifty-two million, seven hundred seventy-nine thousand, seven hundred twenty-one".