16561113 has 4 divisors (see below), whose sum is σ = 22081488. Its totient is φ = 11040740.

The previous prime is 16561093. The next prime is 16561147. The reversal of 16561113 is 31116561.

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 16561113 - 2⁶ = 16561049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16561313) 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, 2760183 + ... + 2760188.

It is an arithmetic number, because the mean of its divisors is an integer number (5520372).

Almost surely, 2^16561113 is an apocalyptic number.

It is an amenable number.

16561113 is a deficient number, since it is larger than the sum of its proper divisors (5520375).

16561113 is an equidigital number, since it uses as much as digits as its factorization.

16561113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520374.

The product of its digits is 540, while the sum is 24.

The square root of 16561113 is about 4069.5347399918. The cubic root of 16561113 is about 254.8960899202.

Adding to 16561113 its reverse (31116561), we get a palindrome (47677674).

The spelling of 16561113 in words is "sixteen million, five hundred sixty-one thousand, one hundred thirteen".