42171169 has 12 divisors (see below), whose sum is σ = 45034444. Its totient is φ = 39481344.

The previous prime is 42171163. The next prime is 42171179. The reversal of 42171169 is 96117124.

It can be written as a sum of positive squares in 6 ways, for example, as 90000 + 42081169 = 300^2 + 6487^2 .

It is not a de Polignac number, because 42171169 - 2¹⁵ = 42138401 is a prime.

It is a super-2 number, since 2×42171169² = 3556814989653122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42171169.

It is not an unprimeable number, because it can be changed into a prime (42171163) 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, 97177 + ... + 97609.

Almost surely, 2^42171169 is an apocalyptic number.

It is an amenable number.

42171169 is a deficient number, since it is larger than the sum of its proper divisors (2863275).

42171169 is a wasteful number, since it uses less digits than its factorization.

42171169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 787 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 42171169 is about 6493.9332457302. The cubic root of 42171169 is about 348.0742371459.

The spelling of 42171169 in words is "forty-two million, one hundred seventy-one thousand, one hundred sixty-nine".