42002000009 has 2 divisors, whose sum is σ = 42002000010. Its totient is φ = 42002000008.

The previous prime is 42001999937. The next prime is 42002000059. The reversal of 42002000009 is 90000020024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41893902400 + 108097609 = 204680^2 + 10397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42002000009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42002000059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21001000004 + 21001000005.

It is an arithmetic number, because the mean of its divisors is an integer number (21001000005).

Almost surely, 2^42002000009 is an apocalyptic number.

It is an amenable number.

42002000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

42002000009 is an equidigital number, since it uses as much as digits as its factorization.

42002000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The spelling of 42002000009 in words is "forty-two billion, two million, nine", and thus it is an aban number and an uban number.