42891193 has 4 divisors (see below), whose sum is σ = 42933748. Its totient is φ = 42848640.

The previous prime is 42891181. The next prime is 42891209. The reversal of 42891193 is 39119824.

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 39476089 + 3415104 = 6283^2 + 1848^2 .

It is a cyclic number.

It is not a de Polignac number, because 42891193 - 2¹⁷ = 42760121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42891133) 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, 19728 + ... + 21793.

It is an arithmetic number, because the mean of its divisors is an integer number (10733437).

Almost surely, 2^42891193 is an apocalyptic number.

It is an amenable number.

42891193 is a deficient number, since it is larger than the sum of its proper divisors (42555).

42891193 is a wasteful number, since it uses less digits than its factorization.

42891193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42554.

The product of its digits is 15552, while the sum is 37.

The square root of 42891193 is about 6549.1368133518. The cubic root of 42891193 is about 350.0440570390.

The spelling of 42891193 in words is "forty-two million, eight hundred ninety-one thousand, one hundred ninety-three".