16987813 has 4 divisors (see below), whose sum is σ = 17012160. Its totient is φ = 16963468.

The previous prime is 16987807. The next prime is 16987853. The reversal of 16987813 is 31878961.

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: 31878961 = 17 ⋅1875233.

It is a cyclic number.

It is not a de Polignac number, because 16987813 - 2⁵ = 16987781 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 16987813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16987853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11095 + ... + 12532.

It is an arithmetic number, because the mean of its divisors is an integer number (4253040).

Almost surely, 2^16987813 is an apocalyptic number.

It is an amenable number.

16987813 is a deficient number, since it is larger than the sum of its proper divisors (24347).

16987813 is an equidigital number, since it uses as much as digits as its factorization.

16987813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24346.

The product of its digits is 72576, while the sum is 43.

The square root of 16987813 is about 4121.6274698231. The cubic root of 16987813 is about 257.0667008308.

The spelling of 16987813 in words is "sixteen million, nine hundred eighty-seven thousand, eight hundred thirteen".