16649801 has 4 divisors (see below), whose sum is σ = 19028352. Its totient is φ = 14271252.

The previous prime is 16649779. The next prime is 16649807. The reversal of 16649801 is 10894661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10894661 = 61 ⋅178601.

It is a cyclic number.

It is not a de Polignac number, because 16649801 - 2¹⁰ = 16648777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16649807) 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 in 3 ways as a sum of consecutive naturals, for example, 1189265 + ... + 1189278.

It is an arithmetic number, because the mean of its divisors is an integer number (4757088).

Almost surely, 2^16649801 is an apocalyptic number.

It is an amenable number.

16649801 is a deficient number, since it is larger than the sum of its proper divisors (2378551).

16649801 is an equidigital number, since it uses as much as digits as its factorization.

16649801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378550.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 16649801 is about 4080.4167679295. The cubic root of 16649801 is about 255.3502862549.

The spelling of 16649801 in words is "sixteen million, six hundred forty-nine thousand, eight hundred one".