16984981 has 8 divisors (see below), whose sum is σ = 18922680. Its totient is φ = 15137472.

The previous prime is 16984951. The next prime is 16984987. The reversal of 16984981 is 18948961.

It can be written as a sum of positive squares in 4 ways, for example, as 1540081 + 15444900 = 1241^2 + 3930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16984981 - 2⁵ = 16984949 is a prime.

It is a super-2 number, since 2×16984981² = 576979159140722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16984987) 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 7 ways as a sum of consecutive naturals, for example, 22150 + ... + 22903.

It is an arithmetic number, because the mean of its divisors is an integer number (2365335).

Almost surely, 2^16984981 is an apocalyptic number.

It is an amenable number.

16984981 is a deficient number, since it is larger than the sum of its proper divisors (1937699).

16984981 is a wasteful number, since it uses less digits than its factorization.

16984981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45095.

The product of its digits is 124416, while the sum is 46.

The square root of 16984981 is about 4121.2839018927. The cubic root of 16984981 is about 257.0524150336.

The spelling of 16984981 in words is "sixteen million, nine hundred eighty-four thousand, nine hundred eighty-one".