16311289 has 2 divisors, whose sum is σ = 16311290. Its totient is φ = 16311288.

The previous prime is 16311277. The next prime is 16311299. The reversal of 16311289 is 98211361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15327225 + 984064 = 3915^2 + 992^2 .

It is a cyclic number.

It is not a de Polignac number, because 16311289 - 2⁷ = 16311161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16311289.

It is not a weakly prime, because it can be changed into another prime (16311299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8155644 + 8155645.

It is an arithmetic number, because the mean of its divisors is an integer number (8155645).

Almost surely, 2^16311289 is an apocalyptic number.

It is an amenable number.

16311289 is a deficient number, since it is larger than the sum of its proper divisors (1).

16311289 is an equidigital number, since it uses as much as digits as its factorization.

16311289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The square root of 16311289 is about 4038.7236845320. The cubic root of 16311289 is about 253.6078900460.

The spelling of 16311289 in words is "sixteen million, three hundred eleven thousand, two hundred eighty-nine".