641817 has 16 divisors (see below), whose sum is σ = 1037760. Its totient is φ = 388800.

The previous prime is 641813. The next prime is 641819. The reversal of 641817 is 718146.

It is a happy number.

641817 is a `hidden beast` number, since 641 + 8 + 17 = 666.

641817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641817 - 2² = 641813 is a prime.

It is a super-2 number, since 2×641817² = 823858122978, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (641813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 784 + ... + 1377.

It is an arithmetic number, because the mean of its divisors is an integer number (64860).

2⁶⁴¹⁸¹⁷ is an apocalyptic number.

It is an amenable number.

641817 is a deficient number, since it is larger than the sum of its proper divisors (395943).

641817 is a wasteful number, since it uses less digits than its factorization.

641817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2175 counting only the distinct ones).

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

The square root of 641817 is about 801.1348201146. The cubic root of 641817 is about 86.2588648733.

It can be divided in two parts, 64 and 1817, that added together give a palindrome (1881).

The spelling of 641817 in words is "six hundred forty-one thousand, eight hundred seventeen".