16311217 has 16 divisors (see below), whose sum is σ = 18179392. Its totient is φ = 14541120.

The previous prime is 16311173. The next prime is 16311223. The reversal of 16311217 is 71211361.

It is a cyclic number.

It is not a de Polignac number, because 16311217 - 2⁷ = 16311089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16311277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52978 + ... + 53284.

It is an arithmetic number, because the mean of its divisors is an integer number (1136212).

Almost surely, 2^16311217 is an apocalyptic number.

It is an amenable number.

16311217 is a deficient number, since it is larger than the sum of its proper divisors (1868175).

16311217 is a wasteful number, since it uses less digits than its factorization.

16311217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its digits is 252, while the sum is 22.

The square root of 16311217 is about 4038.7147708151. The cubic root of 16311217 is about 253.6075168935.

Adding to 16311217 its reverse (71211361), we get a palindrome (87522578).

The spelling of 16311217 in words is "sixteen million, three hundred eleven thousand, two hundred seventeen".