16704561 has 4 divisors (see below), whose sum is σ = 22272752. Its totient is φ = 11136372.

The previous prime is 16704529. The next prime is 16704563. The reversal of 16704561 is 16540761.

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: 16540761 = 3 ⋅5513587.

It is not a de Polignac number, because 16704561 - 2⁵ = 16704529 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16704563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2784091 + ... + 2784096.

It is an arithmetic number, because the mean of its divisors is an integer number (5568188).

Almost surely, 2^16704561 is an apocalyptic number.

It is an amenable number.

16704561 is a deficient number, since it is larger than the sum of its proper divisors (5568191).

16704561 is an equidigital number, since it uses as much as digits as its factorization.

16704561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5568190.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 16704561 is about 4087.1213586093. The cubic root of 16704561 is about 255.6299228293.

The spelling of 16704561 in words is "sixteen million, seven hundred four thousand, five hundred sixty-one".