16911289 has 2 divisors, whose sum is σ = 16911290. Its totient is φ = 16911288.

The previous prime is 16911287. The next prime is 16911299. The reversal of 16911289 is 98211961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11505664 + 5405625 = 3392^2 + 2325^2 .

It is an emirp because it is prime and its reverse (98211961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16911289 - 2¹ = 16911287 is a prime.

Together with 16911287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16911283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8455644 + 8455645.

It is an arithmetic number, because the mean of its divisors is an integer number (8455645).

Almost surely, 2^16911289 is an apocalyptic number.

It is an amenable number.

16911289 is a deficient number, since it is larger than the sum of its proper divisors (1).

16911289 is an equidigital number, since it uses as much as digits as its factorization.

16911289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 37.

The square root of 16911289 is about 4112.3337656372. Note that the first 3 decimals coincide. The cubic root of 16911289 is about 256.6801220434.

The spelling of 16911289 in words is "sixteen million, nine hundred eleven thousand, two hundred eighty-nine".