16311689 has 2 divisors, whose sum is σ = 16311690. Its totient is φ = 16311688.

The previous prime is 16311667. The next prime is 16311707. The reversal of 16311689 is 98611361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 4443664 = 3445^2 + 2108^2 .

It is a cyclic number.

It is not a de Polignac number, because 16311689 - 2¹² = 16307593 is a prime.

It is not a weakly prime, because it can be changed into another prime (16311649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8155844 + 8155845.

It is an arithmetic number, because the mean of its divisors is an integer number (8155845).

Almost surely, 2^16311689 is an apocalyptic number.

It is an amenable number.

16311689 is a deficient number, since it is larger than the sum of its proper divisors (1).

16311689 is an equidigital number, since it uses as much as digits as its factorization.

16311689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The square root of 16311689 is about 4038.7732048235. The cubic root of 16311689 is about 253.6099630955.

The spelling of 16311689 in words is "sixteen million, three hundred eleven thousand, six hundred eighty-nine".