42118091 has 4 divisors (see below), whose sum is σ = 42148800. Its totient is φ = 42087384.

The previous prime is 42118067. The next prime is 42118189. The reversal of 42118091 is 19081124.

42118091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42118091 - 2¹⁰ = 42117067 is a prime.

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 42118091.

It is not an unprimeable number, because it can be changed into a prime (42118031) 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 3 ways as a sum of consecutive naturals, for example, 13196 + ... + 16073.

It is an arithmetic number, because the mean of its divisors is an integer number (10537200).

Almost surely, 2^42118091 is an apocalyptic number.

42118091 is a deficient number, since it is larger than the sum of its proper divisors (30709).

42118091 is a wasteful number, since it uses less digits than its factorization.

42118091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30708.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 42118091 is about 6489.8452215750. The cubic root of 42118091 is about 347.9281433308.

The spelling of 42118091 in words is "forty-two million, one hundred eighteen thousand, ninety-one".