641291218 has 16 divisors (see below), whose sum is σ = 992145024. Its totient is φ = 310711600.

The previous prime is 641291213. The next prime is 641291219. The reversal of 641291218 is 812192146.

It is a happy number.

641291218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641291218² = 822508852567847048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641291213) 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, 24280 + ... + 43267.

It is an arithmetic number, because the mean of its divisors is an integer number (62009064).

Almost surely, 2^641291218 is an apocalyptic number.

641291218 is a deficient number, since it is larger than the sum of its proper divisors (350853806).

641291218 is a wasteful number, since it uses less digits than its factorization.

641291218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67697.

The product of its digits is 6912, while the sum is 34.

The square root of 641291218 is about 25323.7283589917. The cubic root of 641291218 is about 862.3530377063.

The spelling of 641291218 in words is "six hundred forty-one million, two hundred ninety-one thousand, two hundred eighteen".