42181169 has 4 divisors (see below), whose sum is σ = 43210020. Its totient is φ = 41152320.

The previous prime is 42181157. The next prime is 42181189. The reversal of 42181169 is 96118124.

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 2930944 + 39250225 = 1712^2 + 6265^2 .

It is a cyclic number.

It is not a de Polignac number, because 42181169 - 2²⁴ = 25403953 is a prime.

It is a super-2 number, since 2×42181169² = 3558502036413122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42181189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514364 + ... + 514445.

It is an arithmetic number, because the mean of its divisors is an integer number (10802505).

Almost surely, 2^42181169 is an apocalyptic number.

It is an amenable number.

42181169 is a deficient number, since it is larger than the sum of its proper divisors (1028851).

42181169 is a wasteful number, since it uses less digits than its factorization.

42181169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028850.

The product of its digits is 3456, while the sum is 32.

The square root of 42181169 is about 6494.7031494904. The cubic root of 42181169 is about 348.1017477838.

The spelling of 42181169 in words is "forty-two million, one hundred eighty-one thousand, one hundred sixty-nine".