16920191 has 2 divisors, whose sum is σ = 16920192. Its totient is φ = 16920190.

The previous prime is 16920181. The next prime is 16920217. The reversal of 16920191 is 19102961.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16920191 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 (16920181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8460095 + 8460096.

It is an arithmetic number, because the mean of its divisors is an integer number (8460096).

Almost surely, 2^16920191 is an apocalyptic number.

16920191 is a deficient number, since it is larger than the sum of its proper divisors (1).

16920191 is an equidigital number, since it uses as much as digits as its factorization.

16920191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 16920191 is about 4113.4159770196. The cubic root of 16920191 is about 256.7251524298.

The spelling of 16920191 in words is "sixteen million, nine hundred twenty thousand, one hundred ninety-one".