42001191 has 12 divisors (see below), whose sum is σ = 63861720. Its totient is φ = 26526960.

The previous prime is 42001189. The next prime is 42001199. The reversal of 42001191 is 19110024.

It is not a de Polignac number, because 42001191 - 2¹ = 42001189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42001199) 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 11 ways as a sum of consecutive naturals, for example, 122640 + ... + 122981.

It is an arithmetic number, because the mean of its divisors is an integer number (5321810).

Almost surely, 2^42001191 is an apocalyptic number.

42001191 is a deficient number, since it is larger than the sum of its proper divisors (21860529).

42001191 is a wasteful number, since it uses less digits than its factorization.

42001191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245646 (or 245643 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 42001191 is about 6480.8325854014. The cubic root of 42001191 is about 347.6059501304.

The spelling of 42001191 in words is "forty-two million, one thousand, one hundred ninety-one".