16689349 has 2 divisors, whose sum is σ = 16689350. Its totient is φ = 16689348.

The previous prime is 16689311. The next prime is 16689367. The reversal of 16689349 is 94398661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9345249 + 7344100 = 3057^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 16689349 - 2⁷ = 16689221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16689299 and 16689308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16689649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344674 + 8344675.

It is an arithmetic number, because the mean of its divisors is an integer number (8344675).

Almost surely, 2^16689349 is an apocalyptic number.

It is an amenable number.

16689349 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689349 is an equidigital number, since it uses as much as digits as its factorization.

16689349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 16689349 is about 4085.2599672481. The cubic root of 16689349 is about 255.5523028431.

The spelling of 16689349 in words is "sixteen million, six hundred eighty-nine thousand, three hundred forty-nine".