16596981 has 30 divisors (see below), whose sum is σ = 26374370. Its totient is φ = 10399104.

The previous prime is 16596973. The next prime is 16597033. The reversal of 16596981 is 18969561.

It can be written as a sum of positive squares in 3 ways, for example, as 3572100 + 13024881 = 1890^2 + 3609^2 .

It is not a de Polignac number, because 16596981 - 2³ = 16596973 is a prime.

It is a super-2 number, since 2×16596981² = 550919556628722, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (116640) is a multiple of the sum of its prime divisors (729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16596901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 23055 + ... + 23763.

Almost surely, 2^16596981 is an apocalyptic number.

It is an amenable number.

16596981 is a deficient number, since it is larger than the sum of its proper divisors (9777389).

16596981 is an equidigital number, since it uses as much as digits as its factorization.

16596981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755 (or 729 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 16596981 is about 4073.9392484425. The cubic root of 16596981 is about 255.0799749151.

The spelling of 16596981 in words is "sixteen million, five hundred ninety-six thousand, nine hundred eighty-one".