42020191 has 8 divisors (see below), whose sum is σ = 44467200. Its totient is φ = 39596760.

The previous prime is 42020171. The next prime is 42020201. The reversal of 42020191 is 19102024.

42020191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42020191 - 2⁷ = 42020063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42020131) 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 7 ways as a sum of consecutive naturals, for example, 2161 + ... + 9418.

It is an arithmetic number, because the mean of its divisors is an integer number (5558400).

Almost surely, 2^42020191 is an apocalyptic number.

42020191 is a deficient number, since it is larger than the sum of its proper divisors (2447009).

42020191 is a wasteful number, since it uses less digits than its factorization.

42020191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11789.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 42020191 is about 6482.2982807026. The cubic root of 42020191 is about 347.6583575126.

The spelling of 42020191 in words is "forty-two million, twenty thousand, one hundred ninety-one".