16505289 has 16 divisors (see below), whose sum is σ = 24757440. Its totient is φ = 11002068.

The previous prime is 16505273. The next prime is 16505303. The reversal of 16505289 is 98250561.

It is a happy number.

It is not a de Polignac number, because 16505289 - 2⁴ = 16505273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16505389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1587 + ... + 5960.

It is an arithmetic number, because the mean of its divisors is an integer number (1547340).

Almost surely, 2^16505289 is an apocalyptic number.

It is an amenable number.

16505289 is a deficient number, since it is larger than the sum of its proper divisors (8252151).

16505289 is an frugal number, since it uses more digits than its factorization.

16505289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7568 (or 7550 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 16505289 is about 4062.6701810509. The cubic root of 16505289 is about 254.6093672960.

The spelling of 16505289 in words is "sixteen million, five hundred five thousand, two hundred eighty-nine".