16976981 has 6 divisors (see below), whose sum is σ = 19748790. Its totient is φ = 14551656.

The previous prime is 16976963. The next prime is 16976983. The reversal of 16976981 is 18967961.

It can be written as a sum of positive squares in only one way, i.e., 15476356 + 1500625 = 3934^2 + 1225^2 .

It is not a de Polignac number, because 16976981 - 2¹⁰ = 16975957 is a prime.

It is a super-2 number, since 2×16976981² = 576435767748722, 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 (16976983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173186 + ... + 173283.

It is an arithmetic number, because the mean of its divisors is an integer number (3291465).

Almost surely, 2^16976981 is an apocalyptic number.

It is an amenable number.

16976981 is a deficient number, since it is larger than the sum of its proper divisors (2771809).

16976981 is an equidigital number, since it uses as much as digits as its factorization.

16976981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346483 (or 346476 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 16976981 is about 4120.3132162495. The cubic root of 16976981 is about 257.0120510935.

The spelling of 16976981 in words is "sixteen million, nine hundred seventy-six thousand, nine hundred eighty-one".