16059509 has 4 divisors (see below), whose sum is σ = 17004204. Its totient is φ = 15114816.

The previous prime is 16059493. The next prime is 16059529. The reversal of 16059509 is 90595061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4937284 + 11122225 = 2222^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 16059509 - 2⁴ = 16059493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16059529) 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, 472322 + ... + 472355.

It is an arithmetic number, because the mean of its divisors is an integer number (4251051).

Almost surely, 2^16059509 is an apocalyptic number.

It is an amenable number.

16059509 is a deficient number, since it is larger than the sum of its proper divisors (944695).

16059509 is an equidigital number, since it uses as much as digits as its factorization.

16059509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944694.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 16059509 is about 4007.4317211900. The cubic root of 16059509 is about 252.2962261436.

The spelling of 16059509 in words is "sixteen million, fifty-nine thousand, five hundred nine".