42191189 has 4 divisors (see below), whose sum is σ = 42375660. Its totient is φ = 42006720.

The previous prime is 42191179. The next prime is 42191197. The reversal of 42191189 is 98119124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33292900 + 8898289 = 5770^2 + 2983^2 .

It is a cyclic number.

It is not a de Polignac number, because 42191189 - 2¹⁶ = 42125653 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 (42191119) 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, 91892 + ... + 92349.

It is an arithmetic number, because the mean of its divisors is an integer number (10593915).

Almost surely, 2^42191189 is an apocalyptic number.

It is an amenable number.

42191189 is a deficient number, since it is larger than the sum of its proper divisors (184471).

42191189 is a wasteful number, since it uses less digits than its factorization.

42191189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184470.

The product of its digits is 5184, while the sum is 35.

The square root of 42191189 is about 6495.4745015280. The cubic root of 42191189 is about 348.1293090822.

The spelling of 42191189 in words is "forty-two million, one hundred ninety-one thousand, one hundred eighty-nine".