16993509 has 8 divisors (see below), whose sum is σ = 24400992. Its totient is φ = 10457520.

The previous prime is 16993477. The next prime is 16993517. The reversal of 16993509 is 90539961.

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

It is not a de Polignac number, because 16993509 - 2⁵ = 16993477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16993579) 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, 217827 + ... + 217904.

It is an arithmetic number, because the mean of its divisors is an integer number (3050124).

Almost surely, 2^16993509 is an apocalyptic number.

It is an amenable number.

16993509 is a deficient number, since it is larger than the sum of its proper divisors (7407483).

16993509 is a wasteful number, since it uses less digits than its factorization.

16993509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435747.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 16993509 is about 4122.3184010942. The cubic root of 16993509 is about 257.0954290394.

The spelling of 16993509 in words is "sixteen million, nine hundred ninety-three thousand, five hundred nine".