16536809 has 4 divisors (see below), whose sum is σ = 16888704. Its totient is φ = 16184916.

The previous prime is 16536787. The next prime is 16536827. The reversal of 16536809 is 90863561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90863561 = 461 ⋅197101.

It is a cyclic number.

It is not a de Polignac number, because 16536809 - 2¹² = 16532713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16536109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175877 + ... + 175970.

It is an arithmetic number, because the mean of its divisors is an integer number (4222176).

Almost surely, 2^16536809 is an apocalyptic number.

It is an amenable number.

16536809 is a deficient number, since it is larger than the sum of its proper divisors (351895).

16536809 is an equidigital number, since it uses as much as digits as its factorization.

16536809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351894.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 16536809 is about 4066.5475529004. The cubic root of 16536809 is about 254.7713392971.

The spelling of 16536809 in words is "sixteen million, five hundred thirty-six thousand, eight hundred nine".