16689133 has 2 divisors, whose sum is σ = 16689134. Its totient is φ = 16689132.

The previous prime is 16689107. The next prime is 16689143. The reversal of 16689133 is 33198661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16630084 + 59049 = 4078^2 + 243^2 .

It is an emirp because it is prime and its reverse (33198661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16689133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16689092 and 16689101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16689103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344566 + 8344567.

It is an arithmetic number, because the mean of its divisors is an integer number (8344567).

Almost surely, 2^16689133 is an apocalyptic number.

It is an amenable number.

16689133 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689133 is an equidigital number, since it uses as much as digits as its factorization.

16689133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 16689133 is about 4085.2335306565. The cubic root of 16689133 is about 255.5512003529.

It can be divided in two parts, 1668 and 9133, that added together give a palindrome (10801).

The spelling of 16689133 in words is "sixteen million, six hundred eighty-nine thousand, one hundred thirty-three".