17986081 has 3 divisors (see below), whose sum is σ = 17990323. Its totient is φ = 17981840.

The previous prime is 17986079. The next prime is 17986093. The reversal of 17986081 is 18068971.

The square root of 17986081 is 4241.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 17715681 + 270400 = 4209^2 + 520^2 .

It is not a de Polignac number, because 17986081 - 2¹ = 17986079 is a prime.

It is a super-2 number, since 2×17986081² = 646998219477122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17986021) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2121 + ... + 6361.

Almost surely, 2^17986081 is an apocalyptic number.

17986081 is the 4241-st square number.

17986081 is the 2121-st centered octagonal number.

It is an amenable number.

17986081 is a deficient number, since it is larger than the sum of its proper divisors (4242).

17986081 is an frugal number, since it uses more digits than its factorization.

17986081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8482 (or 4241 counting only the distinct ones).

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

The cubic root of 17986081 is about 262.0065699652.

The spelling of 17986081 in words is "seventeen million, nine hundred eighty-six thousand, eighty-one".