16993081 has 8 divisors (see below), whose sum is σ = 20563200. Its totient is φ = 13708608.

The previous prime is 16993073. The next prime is 16993099. The reversal of 16993081 is 18039961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16993081 - 2³ = 16993073 is a prime.

It is a super-2 number, since 2×16993081² = 577529603745122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16993081.

It is not an unprimeable number, because it can be changed into a prime (16993051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71281 + ... + 71518.

It is an arithmetic number, because the mean of its divisors is an integer number (2570400).

Almost surely, 2^16993081 is an apocalyptic number.

It is an amenable number.

16993081 is a deficient number, since it is larger than the sum of its proper divisors (3570119).

16993081 is a wasteful number, since it uses less digits than its factorization.

16993081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142823.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 16993081 is about 4122.2664882319. The cubic root of 16993081 is about 257.0932706119.

The spelling of 16993081 in words is "sixteen million, nine hundred ninety-three thousand, eighty-one".