16213609 has 2 divisors, whose sum is σ = 16213610. Its totient is φ = 16213608.

The previous prime is 16213607. The next prime is 16213649. The reversal of 16213609 is 90631261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 3504384 = 3565^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 16213609 - 2¹ = 16213607 is a prime.

It is a super-2 number, since 2×16213609² = 525762233609762, which contains 22 as substring.

Together with 16213607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16213607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8106804 + 8106805.

It is an arithmetic number, because the mean of its divisors is an integer number (8106805).

Almost surely, 2^16213609 is an apocalyptic number.

It is an amenable number.

16213609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16213609 is an equidigital number, since it uses as much as digits as its factorization.

16213609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 16213609 is about 4026.6125962153. The cubic root of 16213609 is about 253.1006333096.

The spelling of 16213609 in words is "sixteen million, two hundred thirteen thousand, six hundred nine".