42889109 has 2 divisors, whose sum is σ = 42889110. Its totient is φ = 42889108.

The previous prime is 42889087. The next prime is 42889117. The reversal of 42889109 is 90198824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 3073009 = 6310^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 42889109 - 2²⁴ = 26111893 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42889129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21444554 + 21444555.

It is an arithmetic number, because the mean of its divisors is an integer number (21444555).

Almost surely, 2^42889109 is an apocalyptic number.

It is an amenable number.

42889109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42889109 is an equidigital number, since it uses as much as digits as its factorization.

42889109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 42889109 is about 6548.9777064821. The cubic root of 42889109 is about 350.0383876263.

The spelling of 42889109 in words is "forty-two million, eight hundred eighty-nine thousand, one hundred nine".