16609543 has 2 divisors, whose sum is σ = 16609544. Its totient is φ = 16609542.

The previous prime is 16609499. The next prime is 16609603. The reversal of 16609543 is 34590661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16609543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16609499 and 16609508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16609343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8304771 + 8304772.

It is an arithmetic number, because the mean of its divisors is an integer number (8304772).

Almost surely, 2^16609543 is an apocalyptic number.

16609543 is a deficient number, since it is larger than the sum of its proper divisors (1).

16609543 is an equidigital number, since it uses as much as digits as its factorization.

16609543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 16609543 is about 4075.4807078429. The cubic root of 16609543 is about 255.1443140571.

The spelling of 16609543 in words is "sixteen million, six hundred nine thousand, five hundred forty-three".