16005001 has 2 divisors, whose sum is σ = 16005002. Its totient is φ = 16005000.

The previous prime is 16004999. The next prime is 16005019. The reversal of 16005001 is 10050061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 1565001 = 3800^2 + 1251^2 .

It is a cyclic number.

It is not a de Polignac number, because 16005001 - 2¹ = 16004999 is a prime.

Together with 16004999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16005091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002500 + 8002501.

It is an arithmetic number, because the mean of its divisors is an integer number (8002501).

Almost surely, 2^16005001 is an apocalyptic number.

It is an amenable number.

16005001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16005001 is an equidigital number, since it uses as much as digits as its factorization.

16005001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 16005001 is about 4000.6250761600. The cubic root of 16005001 is about 252.0104608490.

Adding to 16005001 its reverse (10050061), we get a palindrome (26055062).

The spelling of 16005001 in words is "sixteen million, five thousand, one".