4009001 has 2 divisors, whose sum is σ = 4009002. Its totient is φ = 4009000.

The previous prime is 4008997. The next prime is 4009003. The reversal of 4009001 is 1009004.

4009001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2483776 + 1525225 = 1576^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 4009001 - 2² = 4008997 is a prime.

Together with 4009003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4009003) 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, 2004500 + 2004501.

It is an arithmetic number, because the mean of its divisors is an integer number (2004501).

Almost surely, 2^4009001 is an apocalyptic number.

It is an amenable number.

4009001 is a deficient number, since it is larger than the sum of its proper divisors (1).

4009001 is an equidigital number, since it uses as much as digits as its factorization.

4009001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 4009001 is about 2002.2489855160. The cubic root of 4009001 is about 158.8590843044.

The spelling of 4009001 in words is "four million, nine thousand, one".