42169 has 2 divisors, whose sum is σ = 42170. Its totient is φ = 42168.

The previous prime is 42157. The next prime is 42179. The reversal of 42169 is 96124.

42169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42025 + 144 = 205^2 + 12^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42169 is a prime.

It is a super-2 number, since 2×42169² = 3556449122, which contains 22 as substring.

It is a Chen prime.

42169 is a lucky number.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (42139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21084 + 21085.

It is an arithmetic number, because the mean of its divisors is an integer number (21085).

2⁴²¹⁶⁹ is an apocalyptic number.

It is an amenable number.

42169 is a deficient number, since it is larger than the sum of its proper divisors (1).

42169 is an equidigital number, since it uses as much as digits as its factorization.

42169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 42169 is about 205.3509191603. The cubic root of 42169 is about 34.8068269515.

It can be divided in two parts, 4216 and 9, that added together give a square (4225 = 65²).

The spelling of 42169 in words is "forty-two thousand, one hundred sixty-nine".