42065091 has 12 divisors (see below), whose sum is σ = 63402768. Its totient is φ = 26823984.

The previous prime is 42065087. The next prime is 42065099. The reversal of 42065091 is 19056024.

42065091 is a `hidden beast` number, since 4 + 2 + 0 + 650 + 9 + 1 = 666.

It is not a de Polignac number, because 42065091 - 2² = 42065087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42065099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101400 + ... + 101813.

It is an arithmetic number, because the mean of its divisors is an integer number (5283564).

Almost surely, 2^42065091 is an apocalyptic number.

42065091 is a deficient number, since it is larger than the sum of its proper divisors (21337677).

42065091 is a wasteful number, since it uses less digits than its factorization.

42065091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203242 (or 203239 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 42065091 is about 6485.7606338810. The cubic root of 42065091 is about 347.7821416847.

The spelling of 42065091 in words is "forty-two million, sixty-five thousand, ninety-one".