16531113 has 4 divisors (see below), whose sum is σ = 22041488. Its totient is φ = 11020740.

The previous prime is 16531079. The next prime is 16531139. The reversal of 16531113 is 31113561.

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: 31113561 = 3 ⋅10371187.

It is a de Polignac number, because none of the positive numbers 2^k-16531113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16531113.

It is not an unprimeable number, because it can be changed into a prime (16531313) 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, 2755183 + ... + 2755188.

It is an arithmetic number, because the mean of its divisors is an integer number (5510372).

Almost surely, 2^16531113 is an apocalyptic number.

It is an amenable number.

16531113 is a deficient number, since it is larger than the sum of its proper divisors (5510375).

16531113 is an equidigital number, since it uses as much as digits as its factorization.

16531113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510374.

The product of its digits is 270, while the sum is 21.

The square root of 16531113 is about 4065.8471442001. The cubic root of 16531113 is about 254.7420844754.

Adding to 16531113 its reverse (31113561), we get a palindrome (47644674).

The spelling of 16531113 in words is "sixteen million, five hundred thirty-one thousand, one hundred thirteen".