5247408721 has 9 divisors (see below), whose sum is σ = 5304743899. Its totient is φ = 5190688984.

The previous prime is 5247408713. The next prime is 5247408731. The reversal of 5247408721 is 1278047425.

The square root of 5247408721 is 72439.

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

It can be written as a sum of positive squares in only one way, i.e., 5216450625 + 30958096 = 72225^2 + 5564^2 .

It is not a de Polignac number, because 5247408721 - 2³ = 5247408713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5247408731) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7750635 + ... + 7751311.

Almost surely, 2^5247408721 is an apocalyptic number.

5247408721 is the 72439-th square number.

5247408721 is the 36220-th centered octagonal number.

It is an amenable number.

5247408721 is a deficient number, since it is larger than the sum of its proper divisors (57335178).

5247408721 is an frugal number, since it uses more digits than its factorization.

5247408721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 40.

The cubic root of 5247408721 is about 1737.7273276116.

The spelling of 5247408721 in words is "five billion, two hundred forty-seven million, four hundred eight thousand, seven hundred twenty-one".