16530247 has 4 divisors (see below), whose sum is σ = 17400280. Its totient is φ = 15660216.

The previous prime is 16530221. The next prime is 16530251. The reversal of 16530247 is 74203561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16530247 - 2¹⁵ = 16497479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16530277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434988 + ... + 435025.

It is an arithmetic number, because the mean of its divisors is an integer number (4350070).

Almost surely, 2^16530247 is an apocalyptic number.

16530247 is a deficient number, since it is larger than the sum of its proper divisors (870033).

16530247 is an equidigital number, since it uses as much as digits as its factorization.

16530247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870032.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 16530247 is about 4065.7406459340. The cubic root of 16530247 is about 254.7376360857.

The spelling of 16530247 in words is "sixteen million, five hundred thirty thousand, two hundred forty-seven".