42065591 has 4 divisors (see below), whose sum is σ = 42482184. Its totient is φ = 41649000.

The previous prime is 42065581. The next prime is 42065603. The reversal of 42065591 is 19556024.

It is a happy number.

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 42065591 - 2¹⁰ = 42064567 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 (42065501) 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, 208145 + ... + 208346.

It is an arithmetic number, because the mean of its divisors is an integer number (10620546).

Almost surely, 2^42065591 is an apocalyptic number.

42065591 is a deficient number, since it is larger than the sum of its proper divisors (416593).

42065591 is a wasteful number, since it uses less digits than its factorization.

42065591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416592.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 42065591 is about 6485.7991797465. The cubic root of 42065591 is about 347.7835196316.

The spelling of 42065591 in words is "forty-two million, sixty-five thousand, five hundred ninety-one".