16991333 has 2 divisors, whose sum is σ = 16991334. Its totient is φ = 16991332.

The previous prime is 16991329. The next prime is 16991341. The reversal of 16991333 is 33319961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12837889 + 4153444 = 3583^2 + 2038^2 .

It is a cyclic number.

It is not a de Polignac number, because 16991333 - 2² = 16991329 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16991293 and 16991302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16991383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495666 + 8495667.

It is an arithmetic number, because the mean of its divisors is an integer number (8495667).

Almost surely, 2^16991333 is an apocalyptic number.

It is an amenable number.

16991333 is a deficient number, since it is larger than the sum of its proper divisors (1).

16991333 is an equidigital number, since it uses as much as digits as its factorization.

16991333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13122, while the sum is 35.

The square root of 16991333 is about 4122.0544634927. The cubic root of 16991333 is about 257.0844549760.

The spelling of 16991333 in words is "sixteen million, nine hundred ninety-one thousand, three hundred thirty-three".