646159 has 2 divisors, whose sum is σ = 646160. Its totient is φ = 646158.

The previous prime is 646157. The next prime is 646169. The reversal of 646159 is 951646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646159 - 2¹ = 646157 is a prime.

Together with 646157, it forms a pair of twin primes.

646159 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 646159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323079 + 323080.

It is an arithmetic number, because the mean of its divisors is an integer number (323080).

2⁶⁴⁶¹⁵⁹ is an apocalyptic number.

646159 is a deficient number, since it is larger than the sum of its proper divisors (1).

646159 is an equidigital number, since it uses as much as digits as its factorization.

646159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 646159 is about 803.8401582404. The cubic root of 646159 is about 86.4529464426.

The spelling of 646159 in words is "six hundred forty-six thousand, one hundred fifty-nine".