42158591 has 4 divisors (see below), whose sum is σ = 42372792. Its totient is φ = 41944392.

The previous prime is 42158581. The next prime is 42158603. The reversal of 42158591 is 19585124.

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 42158591 - 2¹⁴ = 42142207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42158531) 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, 106805 + ... + 107198.

It is an arithmetic number, because the mean of its divisors is an integer number (10593198).

Almost surely, 2^42158591 is an apocalyptic number.

42158591 is a deficient number, since it is larger than the sum of its proper divisors (214201).

42158591 is a wasteful number, since it uses less digits than its factorization.

42158591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214200.

The product of its digits is 14400, while the sum is 35.

The square root of 42158591 is about 6492.9647311533. The cubic root of 42158591 is about 348.0396280895.

The spelling of 42158591 in words is "forty-two million, one hundred fifty-eight thousand, five hundred ninety-one".