641191 has 4 divisors (see below), whose sum is σ = 643032. Its totient is φ = 639352.

The previous prime is 641167. The next prime is 641197. The reversal of 641191 is 191146.

641191 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 641191 - 2¹¹ = 639143 is a prime.

It is a super-2 number, since 2×641191² = 822251796962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641197) 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, 220 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (160758).

2⁶⁴¹¹⁹¹ is an apocalyptic number.

641191 is a deficient number, since it is larger than the sum of its proper divisors (1841).

641191 is a wasteful number, since it uses less digits than its factorization.

641191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840.

The product of its digits is 216, while the sum is 22.

The square root of 641191 is about 800.7440290130. The cubic root of 641191 is about 86.2308113863.

The spelling of 641191 in words is "six hundred forty-one thousand, one hundred ninety-one".