16219813 has 2 divisors, whose sum is σ = 16219814. Its totient is φ = 16219812.

The previous prime is 16219811. The next prime is 16219817. The reversal of 16219813 is 31891261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11716929 + 4502884 = 3423^2 + 2122^2 .

It is a cyclic number.

It is not a de Polignac number, because 16219813 - 2¹ = 16219811 is a prime.

Together with 16219811, 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 (16219811) 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, 8109906 + 8109907.

It is an arithmetic number, because the mean of its divisors is an integer number (8109907).

Almost surely, 2^16219813 is an apocalyptic number.

It is an amenable number.

16219813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16219813 is an equidigital number, since it uses as much as digits as its factorization.

16219813 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16219813 is about 4027.3828971182. The cubic root of 16219813 is about 253.1329114633.

The spelling of 16219813 in words is "sixteen million, two hundred nineteen thousand, eight hundred thirteen".