6617218 has 4 divisors (see below), whose sum is σ = 9925830. Its totient is φ = 3308608.

The previous prime is 6617197. The next prime is 6617257. The reversal of 6617218 is 8127166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8127166 = 2 ⋅4063583.

It can be written as a sum of positive squares in only one way, i.e., 5508409 + 1108809 = 2347^2 + 1053^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6617218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1654303 + ... + 1654306.

Almost surely, 2^6617218 is an apocalyptic number.

6617218 is a deficient number, since it is larger than the sum of its proper divisors (3308612).

6617218 is a wasteful number, since it uses less digits than its factorization.

6617218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3308611.

The product of its digits is 4032, while the sum is 31.

The square root of 6617218 is about 2572.3953817405. The cubic root of 6617218 is about 187.7407207458.

The spelling of 6617218 in words is "six million, six hundred seventeen thousand, two hundred eighteen".