42012191 has 16 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 36553440.

The previous prime is 42012163. The next prime is 42012203. The reversal of 42012191 is 19121024.

It is not a de Polignac number, because 42012191 - 2⁶ = 42012127 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 (42011191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20240 + ... + 22218.

It is an arithmetic number, because the mean of its divisors is an integer number (2993760).

Almost surely, 2^42012191 is an apocalyptic number.

42012191 is a deficient number, since it is larger than the sum of its proper divisors (5887969).

42012191 is a wasteful number, since it uses less digits than its factorization.

42012191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 42012191 is about 6481.6811862356. The cubic root of 42012191 is about 347.6362931723.

The spelling of 42012191 in words is "forty-two million, twelve thousand, one hundred ninety-one".