16542809 has 8 divisors (see below), whose sum is σ = 17160192. Its totient is φ = 15930720.

The previous prime is 16542797. The next prime is 16542817. The reversal of 16542809 is 90824561.

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 16542809 - 2⁴ = 16542793 is a prime.

It is a super-2 number, since 2×16542809² = 547329059220962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16542829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5717 + ... + 8109.

It is an arithmetic number, because the mean of its divisors is an integer number (2145024).

Almost surely, 2^16542809 is an apocalyptic number.

It is an amenable number.

16542809 is a deficient number, since it is larger than the sum of its proper divisors (617383).

16542809 is a wasteful number, since it uses less digits than its factorization.

16542809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 16542809 is about 4067.2852125220. The cubic root of 16542809 is about 254.8021482074.

The spelling of 16542809 in words is "sixteen million, five hundred forty-two thousand, eight hundred nine".