518721172 has 24 divisors (see below), whose sum is σ = 921920832. Its totient is φ = 255326400.

The previous prime is 518721157. The next prime is 518721179. The reversal of 518721172 is 271127815.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518721179) 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, 338047 + ... + 339577.

It is an arithmetic number, because the mean of its divisors is an integer number (38413368).

Almost surely, 2^518721172 is an apocalyptic number.

It is an amenable number.

518721172 is a deficient number, since it is larger than the sum of its proper divisors (403199660).

518721172 is a wasteful number, since it uses less digits than its factorization.

518721172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799 (or 2797 counting only the distinct ones).

The product of its digits is 7840, while the sum is 34.

The square root of 518721172 is about 22775.4510822508. The cubic root of 518721172 is about 803.4854033188.

Adding to 518721172 its reverse (271127815), we get a palindrome (789848987).

The spelling of 518721172 in words is "five hundred eighteen million, seven hundred twenty-one thousand, one hundred seventy-two".