16343509 has 12 divisors (see below), whose sum is σ = 20475084. Its totient is φ = 12930624.

The previous prime is 16343491. The next prime is 16343519. The reversal of 16343509 is 90534361.

It can be written as a sum of positive squares in 2 ways, for example, as 3598609 + 12744900 = 1897^2 + 3570^2 .

It is not a de Polignac number, because 16343509 - 2¹⁵ = 16310741 is a prime.

It is a super-2 number, since 2×16343509² = 534220572866162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16343519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12192 + ... + 13465.

It is an arithmetic number, because the mean of its divisors is an integer number (1706257).

Almost surely, 2^16343509 is an apocalyptic number.

It is an amenable number.

16343509 is a deficient number, since it is larger than the sum of its proper divisors (4131575).

16343509 is a wasteful number, since it uses less digits than its factorization.

16343509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25684 (or 25677 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 16343509 is about 4042.7106005748. The cubic root of 16343509 is about 253.7747657160.

The spelling of 16343509 in words is "sixteen million, three hundred forty-three thousand, five hundred nine".