16648591 has 2 divisors, whose sum is σ = 16648592. Its totient is φ = 16648590.

The previous prime is 16648589. The next prime is 16648601. The reversal of 16648591 is 19584661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16648591 - 2¹ = 16648589 is a prime.

Together with 16648589, 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 (16648571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324295 + 8324296.

It is an arithmetic number, because the mean of its divisors is an integer number (8324296).

Almost surely, 2^16648591 is an apocalyptic number.

16648591 is a deficient number, since it is larger than the sum of its proper divisors (1).

16648591 is an equidigital number, since it uses as much as digits as its factorization.

16648591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 16648591 is about 4080.2684960674. The cubic root of 16648591 is about 255.3441003685.

The spelling of 16648591 in words is "sixteen million, six hundred forty-eight thousand, five hundred ninety-one".