42687171 has 6 divisors (see below), whose sum is σ = 61659260. Its totient is φ = 28458108.

The previous prime is 42687157. The next prime is 42687173. The reversal of 42687171 is 17178624.

42687171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42687171 - 2¹⁷ = 42556099 is a prime.

It is a super-3 number, since 3×42687171³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42687173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2371501 + ... + 2371518.

Almost surely, 2^42687171 is an apocalyptic number.

42687171 is a deficient number, since it is larger than the sum of its proper divisors (18972089).

42687171 is a wasteful number, since it uses less digits than its factorization.

42687171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743025 (or 4743022 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 42687171 is about 6533.5419949672. The cubic root of 42687171 is about 349.4881525084.

The spelling of 42687171 in words is "forty-two million, six hundred eighty-seven thousand, one hundred seventy-one".