641187 has 12 divisors (see below), whose sum is σ = 933504. Its totient is φ = 424080.

The previous prime is 641167. The next prime is 641197. The reversal of 641187 is 781146.

It is a happy number.

641187 is a `hidden beast` number, since 641 + 18 + 7 = 666.

It is not a de Polignac number, because 641187 - 2¹⁰ = 640163 is a prime.

It is a super-2 number, since 2×641187² = 822241537938, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 641187.

It is not an unprimeable number, because it can be changed into a prime (641167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1533 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (77792).

2⁶⁴¹¹⁸⁷ is an apocalyptic number.

641187 is a deficient number, since it is larger than the sum of its proper divisors (292317).

641187 is a wasteful number, since it uses less digits than its factorization.

641187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 567 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 641187 is about 800.7415313321. The cubic root of 641187 is about 86.2306320721.

It can be divided in two parts, 641 and 187, that added together give a palindrome (828).

The spelling of 641187 in words is "six hundred forty-one thousand, one hundred eighty-seven".