206989499191 has 2 divisors, whose sum is σ = 206989499192. Its totient is φ = 206989499190.

The previous prime is 206989499177. The next prime is 206989499221. The reversal of 206989499191 is 191994989602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206989499191 - 2²⁵ = 206955944759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206989499111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103494749595 + 103494749596.

It is an arithmetic number, because the mean of its divisors is an integer number (103494749596).

Almost surely, 2^206989499191 is an apocalyptic number.

206989499191 is a deficient number, since it is larger than the sum of its proper divisors (1).

206989499191 is an equidigital number, since it uses as much as digits as its factorization.

206989499191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The spelling of 206989499191 in words is "two hundred six billion, nine hundred eighty-nine million, four hundred ninety-nine thousand, one hundred ninety-one".