521481218 has 8 divisors (see below), whose sum is σ = 787402560. Its totient is φ = 259013700.

The previous prime is 521481217. The next prime is 521481221. The reversal of 521481218 is 812184125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (521481211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863078 + ... + 863681.

It is an arithmetic number, because the mean of its divisors is an integer number (98425320).

Almost surely, 2^521481218 is an apocalyptic number.

521481218 is a deficient number, since it is larger than the sum of its proper divisors (265921342).

521481218 is a wasteful number, since it uses less digits than its factorization.

521481218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726912.

The product of its digits is 5120, while the sum is 32.

The square root of 521481218 is about 22835.9632597357. The cubic root of 521481218 is about 804.9079626782.

The spelling of 521481218 in words is "five hundred twenty-one million, four hundred eighty-one thousand, two hundred eighteen".