16911409 has 2 divisors, whose sum is σ = 16911410. Its totient is φ = 16911408.

The previous prime is 16911407. The next prime is 16911443. The reversal of 16911409 is 90411961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13838400 + 3073009 = 3720^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 16911409 - 2¹ = 16911407 is a prime.

Together with 16911407, it forms a pair of twin primes.

It is equal to p_1085935 and since 16911409 and 1085935 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (16911407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8455704 + 8455705.

It is an arithmetic number, because the mean of its divisors is an integer number (8455705).

Almost surely, 2^16911409 is an apocalyptic number.

It is an amenable number.

16911409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16911409 is an equidigital number, since it uses as much as digits as its factorization.

16911409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 16911409 is about 4112.3483558668. The cubic root of 16911409 is about 256.6807291634.

The spelling of 16911409 in words is "sixteen million, nine hundred eleven thousand, four hundred nine".