16688999 has 2 divisors, whose sum is σ = 16689000. Its totient is φ = 16688998.

The previous prime is 16688983. The next prime is 16689061. The reversal of 16688999 is 99988661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16688999 - 2⁴ = 16688983 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16688909) 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, 8344499 + 8344500.

It is an arithmetic number, because the mean of its divisors is an integer number (8344500).

Almost surely, 2^16688999 is an apocalyptic number.

16688999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16688999 is an equidigital number, since it uses as much as digits as its factorization.

16688999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 56.

The square root of 16688999 is about 4085.2171300924. The cubic root of 16688999 is about 255.5505163958.

The spelling of 16688999 in words is "sixteen million, six hundred eighty-eight thousand, nine hundred ninety-nine".