642159 has 12 divisors (see below), whose sum is σ = 1060176. Its totient is φ = 366912.

The previous prime is 642157. The next prime is 642163. The reversal of 642159 is 951246.

642159 is a `hidden beast` number, since 642 + 15 + 9 = 666.

It is not a de Polignac number, because 642159 - 2¹ = 642157 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642151) 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, 5034 + ... + 5159.

It is an arithmetic number, because the mean of its divisors is an integer number (88348).

2⁶⁴²¹⁵⁹ is an apocalyptic number.

642159 is a deficient number, since it is larger than the sum of its proper divisors (418017).

642159 is a wasteful number, since it uses less digits than its factorization.

642159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206 (or 10203 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 642159 is about 801.3482389074. The cubic root of 642159 is about 86.2741835147.

The spelling of 642159 in words is "six hundred forty-two thousand, one hundred fifty-nine".