16980981 has 4 divisors (see below), whose sum is σ = 22641312. Its totient is φ = 11320652.

The previous prime is 16980941. The next prime is 16980983. The reversal of 16980981 is 18908961.

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 16980981 - 2⁷ = 16980853 is a prime.

It is a super-2 number, since 2×16980981² = 576707431444722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16980983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2830161 + ... + 2830166.

It is an arithmetic number, because the mean of its divisors is an integer number (5660328).

Almost surely, 2^16980981 is an apocalyptic number.

It is an amenable number.

16980981 is a deficient number, since it is larger than the sum of its proper divisors (5660331).

16980981 is an equidigital number, since it uses as much as digits as its factorization.

16980981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660330.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 16980981 is about 4120.7985876526. The cubic root of 16980981 is about 257.0322346482.

The spelling of 16980981 in words is "sixteen million, nine hundred eighty thousand, nine hundred eighty-one".