16648991 has 2 divisors, whose sum is σ = 16648992. Its totient is φ = 16648990.

The previous prime is 16648981. The next prime is 16648999. The reversal of 16648991 is 19984661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16648991 - 2¹⁴ = 16632607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16648999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324495 + 8324496.

It is an arithmetic number, because the mean of its divisors is an integer number (8324496).

Almost surely, 2^16648991 is an apocalyptic number.

16648991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16648991 is an equidigital number, since it uses as much as digits as its factorization.

16648991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 16648991 is about 4080.3175121552. The cubic root of 16648991 is about 255.3461453228.

The spelling of 16648991 in words is "sixteen million, six hundred forty-eight thousand, nine hundred ninety-one".