518406121 has 8 divisors (see below), whose sum is σ = 532342664. Its totient is φ = 504645120.

The previous prime is 518406079. The next prime is 518406139. The reversal of 518406121 is 121604815.

It can be written as a sum of positive squares in 4 ways, for example, as 49900096 + 468506025 = 7064^2 + 21645^2 .

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 518406121 - 2⁹ = 518405609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 518406121.

It is not an unprimeable number, because it can be changed into a prime (518406181) 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, 37890 + ... + 49723.

It is an arithmetic number, because the mean of its divisors is an integer number (66542833).

Almost surely, 2^518406121 is an apocalyptic number.

It is an amenable number.

518406121 is a deficient number, since it is larger than the sum of its proper divisors (13936543).

518406121 is an equidigital number, since it uses as much as digits as its factorization.

518406121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87771.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 518406121 is about 22768.5335715764. The cubic root of 518406121 is about 803.3227018139.

The spelling of 518406121 in words is "five hundred eighteen million, four hundred six thousand, one hundred twenty-one".