5319872721 has 20 divisors (see below), whose sum is σ = 8096919732. Its totient is φ = 3479662368.

The previous prime is 5319872689. The next prime is 5319872729. The reversal of 5319872721 is 1272789135.

5319872721 is a `hidden beast` number, since 531 + 98 + 7 + 2 + 7 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2668755600 + 2651117121 = 51660^2 + 51489^2 .

It is not a de Polignac number, because 5319872721 - 2⁵ = 5319872689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5319872729) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 615306 + ... + 623891.

Almost surely, 2^5319872721 is an apocalyptic number.

It is an amenable number.

5319872721 is a deficient number, since it is larger than the sum of its proper divisors (2777047011).

5319872721 is a wasteful number, since it uses less digits than its factorization.

5319872721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239262 (or 1239253 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 5319872721 is about 72937.4575989594. The cubic root of 5319872721 is about 1745.6898251576.

The spelling of 5319872721 in words is "five billion, three hundred nineteen million, eight hundred seventy-two thousand, seven hundred twenty-one".