16591243 has 2 divisors, whose sum is σ = 16591244. Its totient is φ = 16591242.

The previous prime is 16591241. The next prime is 16591247. The reversal of 16591243 is 34219561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16591243 - 2¹ = 16591241 is a prime.

Together with 16591241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16591241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295621 + 8295622.

It is an arithmetic number, because the mean of its divisors is an integer number (8295622).

Almost surely, 2^16591243 is an apocalyptic number.

16591243 is a deficient number, since it is larger than the sum of its proper divisors (1).

16591243 is an equidigital number, since it uses as much as digits as its factorization.

16591243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 16591243 is about 4073.2349551677. The cubic root of 16591243 is about 255.0505756406.

The spelling of 16591243 in words is "sixteen million, five hundred ninety-one thousand, two hundred forty-three".