16001005 has 4 divisors (see below), whose sum is σ = 19201212. Its totient is φ = 12800800.

The previous prime is 16000987. The next prime is 16001081. The reversal of 16001005 is 50010061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8054244 + 7946761 = 2838^2 + 2819^2 .

It is not a de Polignac number, because 16001005 - 2⁵ = 16000973 is a prime.

It is a super-2 number, since 2×16001005² = 512064322020050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600096 + ... + 1600105.

It is an arithmetic number, because the mean of its divisors is an integer number (4800303).

Almost surely, 2^16001005 is an apocalyptic number.

It is an amenable number.

16001005 is a deficient number, since it is larger than the sum of its proper divisors (3200207).

16001005 is an equidigital number, since it uses as much as digits as its factorization.

16001005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200206.

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

The square root of 16001005 is about 4000.1256230274. The cubic root of 16001005 is about 251.9894857879.

Adding to 16001005 its reverse (50010061), we get a palindrome (66011066).

It can be divided in two parts, 1 and 6001005, that added together give a palindrome (6001006).

The spelling of 16001005 in words is "sixteen million, one thousand, five".