16708981 has 2 divisors, whose sum is σ = 16708982. Its totient is φ = 16708980.

The previous prime is 16708963. The next prime is 16708987. The reversal of 16708981 is 18980761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12744900 + 3964081 = 3570^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 16708981 - 2⁹ = 16708469 is a prime.

It is a super-2 number, since 2×16708981² = 558380092116722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16708987) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8354490 + 8354491.

It is an arithmetic number, because the mean of its divisors is an integer number (8354491).

Almost surely, 2^16708981 is an apocalyptic number.

It is an amenable number.

16708981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16708981 is an equidigital number, since it uses as much as digits as its factorization.

16708981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 16708981 is about 4087.6620457176. The cubic root of 16708981 is about 255.6524672633.

It can be divided in two parts, 16708 and 981, that added together give a square (17689 = 133²).

The spelling of 16708981 in words is "sixteen million, seven hundred eight thousand, nine hundred eighty-one".