641111 has 4 divisors (see below), whose sum is σ = 661824. Its totient is φ = 620400.

The previous prime is 641101. The next prime is 641129. The reversal of 641111 is 111146.

641111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 641111 - 2¹⁴ = 624727 is a prime.

It is a super-2 number, since 2×641111² = 822046628642, which contains 22 as substring.

It is a Duffinian number.

641111 is a modest number, since divided by 1111 gives 64 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641111.

It is not an unprimeable number, because it can be changed into a prime (641101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10310 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (165456).

2⁶⁴¹¹¹¹ is an apocalyptic number.

641111 is a deficient number, since it is larger than the sum of its proper divisors (20713).

641111 is a wasteful number, since it uses less digits than its factorization.

641111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20712.

The product of its digits is 24, while the sum is 14.

The square root of 641111 is about 800.6940739134. The cubic root of 641111 is about 86.2272249605.

Adding to 641111 its reverse (111146), we get a palindrome (752257).

The spelling of 641111 in words is "six hundred forty-one thousand, one hundred eleven".