16216639 has 2 divisors, whose sum is σ = 16216640. Its totient is φ = 16216638.

The previous prime is 16216637. The next prime is 16216663. The reversal of 16216639 is 93661261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16216639 - 2¹ = 16216637 is a prime.

Together with 16216637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16216631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108319 + 8108320.

It is an arithmetic number, because the mean of its divisors is an integer number (8108320).

Almost surely, 2^16216639 is an apocalyptic number.

16216639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16216639 is an equidigital number, since it uses as much as digits as its factorization.

16216639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 16216639 is about 4026.9888254129. The cubic root of 16216639 is about 253.1163988136.

The spelling of 16216639 in words is "sixteen million, two hundred sixteen thousand, six hundred thirty-nine".