16641001 has 8 divisors (see below), whose sum is σ = 17958024. Its totient is φ = 15329280.

The previous prime is 16640999. The next prime is 16641019. The reversal of 16641001 is 10014661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 230400 + 16410601 = 480^2 + 4051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16641001 - 2¹ = 16640999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16641001.

It is not an unprimeable number, because it can be changed into a prime (16642001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7335 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (2244753).

Almost surely, 2^16641001 is an apocalyptic number.

It is an amenable number.

16641001 is a deficient number, since it is larger than the sum of its proper divisors (1317023).

16641001 is a wasteful number, since it uses less digits than its factorization.

16641001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16641001 is about 4079.3383041861. The cubic root of 16641001 is about 255.3052911521.

Adding to 16641001 its reverse (10014661), we get a palindrome (26655662).

The spelling of 16641001 in words is "sixteen million, six hundred forty-one thousand, one".