16217689 has 2 divisors, whose sum is σ = 16217690. Its totient is φ = 16217688.

The previous prime is 16217687. The next prime is 16217701. The reversal of 16217689 is 98671261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 3579664 = 3555^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 16217689 - 2¹ = 16217687 is a prime.

Together with 16217687, it forms a pair of twin primes.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (16217683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108844 + 8108845.

It is an arithmetic number, because the mean of its divisors is an integer number (8108845).

Almost surely, 2^16217689 is an apocalyptic number.

It is an amenable number.

16217689 is a deficient number, since it is larger than the sum of its proper divisors (1).

16217689 is an equidigital number, since it uses as much as digits as its factorization.

16217689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 16217689 is about 4027.1191936669. The cubic root of 16217689 is about 253.1218616488.

The spelling of 16217689 in words is "sixteen million, two hundred seventeen thousand, six hundred eighty-nine".