42189617 has 2 divisors, whose sum is σ = 42189618. Its totient is φ = 42189616.

The previous prime is 42189571. The next prime is 42189629. The reversal of 42189617 is 71698124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30294016 + 11895601 = 5504^2 + 3449^2 .

It is a cyclic number.

It is not a de Polignac number, because 42189617 - 2¹⁰ = 42188593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42189517) 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 as a sum of consecutive naturals, namely, 21094808 + 21094809.

It is an arithmetic number, because the mean of its divisors is an integer number (21094809).

Almost surely, 2^42189617 is an apocalyptic number.

It is an amenable number.

42189617 is a deficient number, since it is larger than the sum of its proper divisors (1).

42189617 is an equidigital number, since it uses as much as digits as its factorization.

42189617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 42189617 is about 6495.3534930749. The cubic root of 42189617 is about 348.1249853827.

The spelling of 42189617 in words is "forty-two million, one hundred eighty-nine thousand, six hundred seventeen".