16689503 has 2 divisors, whose sum is σ = 16689504. Its totient is φ = 16689502.

The previous prime is 16689481. The next prime is 16689509. The reversal of 16689503 is 30598661.

It is a strong prime.

It is an emirp because it is prime and its reverse (30598661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16689503 - 2⁸ = 16689247 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16689509) 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 as a sum of consecutive naturals, namely, 8344751 + 8344752.

It is an arithmetic number, because the mean of its divisors is an integer number (8344752).

Almost surely, 2^16689503 is an apocalyptic number.

16689503 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689503 is an equidigital number, since it uses as much as digits as its factorization.

16689503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 16689503 is about 4085.2788154543. The cubic root of 16689503 is about 255.5530888721.

The spelling of 16689503 in words is "sixteen million, six hundred eighty-nine thousand, five hundred three".