16611001 has 12 divisors (see below), whose sum is σ = 18443376. Its totient is φ = 14948120.

The previous prime is 16610999. The next prime is 16611011. The reversal of 16611001 is 10011661.

It is not a de Polignac number, because 16611001 - 2¹ = 16610999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16611011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12306 + ... + 13588.

It is an arithmetic number, because the mean of its divisors is an integer number (1536948).

Almost surely, 2^16611001 is an apocalyptic number.

16611001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16611001 is a deficient number, since it is larger than the sum of its proper divisors (1832375).

16611001 is a wasteful number, since it uses less digits than its factorization.

16611001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412 (or 1401 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 16611001 is about 4075.6595785222. The cubic root of 16611001 is about 255.1517794346.

Adding to 16611001 its reverse (10011661), we get a palindrome (26622662).

It can be divided in two parts, 1661 and 1001, that multiplied together give a palindrome (1662661).

The spelling of 16611001 in words is "sixteen million, six hundred eleven thousand, one".