518121 has 12 divisors (see below), whose sum is σ = 781248. Its totient is φ = 330264.

The previous prime is 518113. The next prime is 518123. The reversal of 518121 is 121815.

It is not a de Polignac number, because 518121 - 2³ = 518113 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 518094 and 518103.

It is not an unprimeable number, because it can be changed into a prime (518123) 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, 1045 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (65104).

2⁵¹⁸¹²¹ is an apocalyptic number.

It is an amenable number.

518121 is a deficient number, since it is larger than the sum of its proper divisors (263127).

518121 is a wasteful number, since it uses less digits than its factorization.

518121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532 (or 2529 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 518121 is about 719.8062239242. The cubic root of 518121 is about 80.3175400199.

Adding to 518121 its reverse (121815), we get a palindrome (639936).

It can be divided in two parts, 5181 and 21, that multiplied together give a palindrome (108801).

The spelling of 518121 in words is "five hundred eighteen thousand, one hundred twenty-one".