16561841 has 4 divisors (see below), whose sum is σ = 16594032. Its totient is φ = 16529652.

The previous prime is 16561823. The next prime is 16561847. The reversal of 16561841 is 14816561.

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.

It is a cyclic number.

It is not a de Polignac number, because 16561841 - 2⁶ = 16561777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16561798 and 16561807.

It is not an unprimeable number, because it can be changed into a prime (16561847) 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, 15311 + ... + 16356.

It is an arithmetic number, because the mean of its divisors is an integer number (4148508).

Almost surely, 2^16561841 is an apocalyptic number.

It is an amenable number.

16561841 is a deficient number, since it is larger than the sum of its proper divisors (32191).

16561841 is an equidigital number, since it uses as much as digits as its factorization.

16561841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32190.

The product of its digits is 5760, while the sum is 32.

The square root of 16561841 is about 4069.6241841231. The cubic root of 16561841 is about 254.8998248068.

The spelling of 16561841 in words is "sixteen million, five hundred sixty-one thousand, eight hundred forty-one".