646117 has 4 divisors (see below), whose sum is σ = 652876. Its totient is φ = 639360.

The previous prime is 646103. The next prime is 646147. The reversal of 646117 is 711646.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 474721 + 171396 = 689^2 + 414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646091 and 646100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234 + ... + 3427.

It is an arithmetic number, because the mean of its divisors is an integer number (163219).

2⁶⁴⁶¹¹⁷ is an apocalyptic number.

It is an amenable number.

646117 is a deficient number, since it is larger than the sum of its proper divisors (6759).

646117 is an equidigital number, since it uses as much as digits as its factorization.

646117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6758.

The product of its digits is 1008, while the sum is 25.

The square root of 646117 is about 803.8140332191. The cubic root of 646117 is about 86.4510732698.

The spelling of 646117 in words is "six hundred forty-six thousand, one hundred seventeen".