513218 has 4 divisors (see below), whose sum is σ = 769830. Its totient is φ = 256608.

The previous prime is 513203. The next prime is 513239. The reversal of 513218 is 812315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 316969 + 196249 = 563^2 + 443^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 513218.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 513218.

It is an unprimeable number.

513218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128303 + ... + 128306.

2⁵¹³²¹⁸ is an apocalyptic number.

513218 is a deficient number, since it is larger than the sum of its proper divisors (256612).

513218 is a wasteful number, since it uses less digits than its factorization.

513218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256611.

The product of its digits is 240, while the sum is 20.

The square root of 513218 is about 716.3923506013. The cubic root of 513218 is about 80.0633872624.

The spelling of 513218 in words is "five hundred thirteen thousand, two hundred eighteen".