16689919 has 2 divisors, whose sum is σ = 16689920. Its totient is φ = 16689918.

The previous prime is 16689913. The next prime is 16689929. The reversal of 16689919 is 91998661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16689919 - 2⁵ = 16689887 is a prime.

It is a super-2 number, since 2×16689919² = 557106792453122, which contains 22 as substring.

It is a Chen 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 (16689913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344959 + 8344960.

It is an arithmetic number, because the mean of its divisors is an integer number (8344960).

Almost surely, 2^16689919 is an apocalyptic number.

16689919 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689919 is an equidigital number, since it uses as much as digits as its factorization.

16689919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 49.

The square root of 16689919 is about 4085.3297296546. The cubic root of 16689919 is about 255.5552121468. Note that the first 3 decimals are identical.

The spelling of 16689919 in words is "sixteen million, six hundred eighty-nine thousand, nine hundred nineteen".