42135091 has 4 divisors (see below), whose sum is σ = 42179632. Its totient is φ = 42090552.

The previous prime is 42135083. The next prime is 42135097. The reversal of 42135091 is 19053124.

42135091 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 42135091 - 2³ = 42135083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42135097) 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, 20820 + ... + 22753.

It is an arithmetic number, because the mean of its divisors is an integer number (10544908).

Almost surely, 2^42135091 is an apocalyptic number.

42135091 is a deficient number, since it is larger than the sum of its proper divisors (44541).

42135091 is an equidigital number, since it uses as much as digits as its factorization.

42135091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44540.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 42135091 is about 6491.1548279178. The cubic root of 42135091 is about 347.9749481019.

The spelling of 42135091 in words is "forty-two million, one hundred thirty-five thousand, ninety-one".