641091 has 8 divisors (see below), whose sum is σ = 932544. Its totient is φ = 388520.

The previous prime is 641089. The next prime is 641093. The reversal of 641091 is 190146.

It is an interprime number because it is at equal distance from previous prime (641089) and next prime (641093).

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

It is not a de Polignac number, because 641091 - 2¹ = 641089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641093) 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, 9681 + ... + 9746.

It is an arithmetic number, because the mean of its divisors is an integer number (116568).

2⁶⁴¹⁰⁹¹ is an apocalyptic number.

641091 is a deficient number, since it is larger than the sum of its proper divisors (291453).

641091 is a wasteful number, since it uses less digits than its factorization.

641091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19441.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 641091 is about 800.6815846515. The cubic root of 641091 is about 86.2263283074.

The spelling of 641091 in words is "six hundred forty-one thousand, ninety-one".