641618 has 8 divisors (see below), whose sum is σ = 980748. Its totient is φ = 314704.

The previous prime is 641581. The next prime is 641623. The reversal of 641618 is 816146.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 12769 = 793^2 + 113^2 .

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

It is a Curzon number.

It is an unprimeable number.

641618 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 in 3 ways as a sum of consecutive naturals, for example, 2921 + ... + 3132.

2⁶⁴¹⁶¹⁸ is an apocalyptic number.

641618 is a deficient number, since it is larger than the sum of its proper divisors (339130).

641618 is a wasteful number, since it uses less digits than its factorization.

641618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108.

The product of its digits is 1152, while the sum is 26.

The square root of 641618 is about 801.0106116650. The cubic root of 641618 is about 86.2499488903.

The spelling of 641618 in words is "six hundred forty-one thousand, six hundred eighteen".