16442609 has 2 divisors, whose sum is σ = 16442610. Its totient is φ = 16442608.

The previous prime is 16442521. The next prime is 16442659. The reversal of 16442609 is 90624461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 2900209 = 3680^2 + 1703^2 .

It is an emirp because it is prime and its reverse (90624461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16442609 is a prime.

It is a super-3 number, since 3×16442609³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16442659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221304 + 8221305.

It is an arithmetic number, because the mean of its divisors is an integer number (8221305).

Almost surely, 2^16442609 is an apocalyptic number.

It is an amenable number.

16442609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442609 is an equidigital number, since it uses as much as digits as its factorization.

16442609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 16442609 is about 4054.9487049777. The cubic root of 16442609 is about 254.2866594340.

The spelling of 16442609 in words is "sixteen million, four hundred forty-two thousand, six hundred nine".