5172538509 has 12 divisors (see below), whose sum is σ = 7566020800. Its totient is φ = 3404708424.

The previous prime is 5172538453. The next prime is 5172538519. The reversal of 5172538509 is 9058352715.

5172538509 is a `hidden beast` number, since 517 + 2 + 53 + 85 + 0 + 9 = 666.

It is not a de Polignac number, because 5172538509 - 2¹² = 5172534413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5172538519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3636799 + ... + 3638220.

Almost surely, 2^5172538509 is an apocalyptic number.

It is an amenable number.

5172538509 is a deficient number, since it is larger than the sum of its proper divisors (2393482291).

5172538509 is a wasteful number, since it uses less digits than its factorization.

5172538509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7275104 (or 7275101 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 5172538509 is about 71920.3622696660. The cubic root of 5172538509 is about 1729.4230547427.

The spelling of 5172538509 in words is "five billion, one hundred seventy-two million, five hundred thirty-eight thousand, five hundred nine".