16229509 has 4 divisors (see below), whose sum is σ = 17184204. Its totient is φ = 15274816.

The previous prime is 16229503. The next prime is 16229519. The reversal of 16229509 is 90592261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90592261 = 31 ⋅2922331.

It can be written as a sum of positive squares in 2 ways, for example, as 5536609 + 10692900 = 2353^2 + 3270^2 .

It is a cyclic number.

It is not a de Polignac number, because 16229509 - 2¹¹ = 16227461 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16229503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477322 + ... + 477355.

It is an arithmetic number, because the mean of its divisors is an integer number (4296051).

Almost surely, 2^16229509 is an apocalyptic number.

It is an amenable number.

16229509 is a deficient number, since it is larger than the sum of its proper divisors (954695).

16229509 is an equidigital number, since it uses as much as digits as its factorization.

16229509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954694.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 16229509 is about 4028.5864766690. The cubic root of 16229509 is about 253.1833413051.

The spelling of 16229509 in words is "sixteen million, two hundred twenty-nine thousand, five hundred nine".