5243518721 has 8 divisors (see below), whose sum is σ = 6001372224. Its totient is φ = 4487860080.

The previous prime is 5243518717. The next prime is 5243518781. The reversal of 5243518721 is 1278153425.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5243518721 - 2² = 5243518717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5243518781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543590 + ... + 553151.

It is an arithmetic number, because the mean of its divisors is an integer number (750171528).

Almost surely, 2^5243518721 is an apocalyptic number.

It is an amenable number.

5243518721 is a deficient number, since it is larger than the sum of its proper divisors (757853503).

5243518721 is a wasteful number, since it uses less digits than its factorization.

5243518721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097431.

The product of its digits is 67200, while the sum is 38.

The square root of 5243518721 is about 72412.1448446322. The cubic root of 5243518721 is about 1737.2978184494.

The spelling of 5243518721 in words is "five billion, two hundred forty-three million, five hundred eighteen thousand, seven hundred twenty-one".