641818 has 16 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 294336.

The previous prime is 641813. The next prime is 641819. The reversal of 641818 is 818146.

641818 is nontrivially palindromic in base 8.

641818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

641818 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

641818 is a modest number, since divided by 1818 gives 64 as remainder.

It is not an unprimeable number, because it can be changed into a prime (641813) 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, 1243 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (65340).

2⁶⁴¹⁸¹⁸ is an apocalyptic number.

641818 is a deficient number, since it is larger than the sum of its proper divisors (403622).

641818 is a wasteful number, since it uses less digits than its factorization.

641818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501.

The product of its digits is 1536, while the sum is 28.

The square root of 641818 is about 801.1354442290. The cubic root of 641818 is about 86.2589096726.

The spelling of 641818 in words is "six hundred forty-one thousand, eight hundred eighteen".