42864109 has 2 divisors, whose sum is σ = 42864110. Its totient is φ = 42864108.

The previous prime is 42864083. The next prime is 42864113. The reversal of 42864109 is 90146824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42863209 + 900 = 6547^2 + 30^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42864109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42864139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21432054 + 21432055.

It is an arithmetic number, because the mean of its divisors is an integer number (21432055).

Almost surely, 2^42864109 is an apocalyptic number.

It is an amenable number.

42864109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42864109 is an equidigital number, since it uses as much as digits as its factorization.

42864109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 42864109 is about 6547.0687334104. The cubic root of 42864109 is about 349.9703621162.

The spelling of 42864109 in words is "forty-two million, eight hundred sixty-four thousand, one hundred nine".