42187161 has 8 divisors (see below), whose sum is σ = 56282944. Its totient is φ = 28108080.

The previous prime is 42187139. The next prime is 42187177. The reversal of 42187161 is 16178124.

42187161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42187161 - 2⁹ = 42186649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42187111) 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 7 ways as a sum of consecutive naturals, for example, 4020 + ... + 10026.

It is an arithmetic number, because the mean of its divisors is an integer number (7035368).

Almost surely, 2^42187161 is an apocalyptic number.

It is an amenable number.

42187161 is a deficient number, since it is larger than the sum of its proper divisors (14095783).

42187161 is a wasteful number, since it uses less digits than its factorization.

42187161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8351.

The product of its digits is 2688, while the sum is 30.

The square root of 42187161 is about 6495.1644320987. The cubic root of 42187161 is about 348.1182300748.

The spelling of 42187161 in words is "forty-two million, one hundred eighty-seven thousand, one hundred sixty-one".