16502009 has 4 divisors (see below), whose sum is σ = 16515840. Its totient is φ = 16488180.

The previous prime is 16501997. The next prime is 16502023. The reversal of 16502009 is 90020561.

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.

It is a cyclic number.

It is not a de Polignac number, because 16502009 - 2⁸ = 16501753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16502809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4937 + ... + 7574.

It is an arithmetic number, because the mean of its divisors is an integer number (4128960).

Almost surely, 2^16502009 is an apocalyptic number.

It is an amenable number.

16502009 is a deficient number, since it is larger than the sum of its proper divisors (13831).

16502009 is a wasteful number, since it uses less digits than its factorization.

16502009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13830.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 16502009 is about 4062.2664855964. The cubic root of 16502009 is about 254.5925004995.

The spelling of 16502009 in words is "sixteen million, five hundred two thousand, nine".