206997671 has 2 divisors, whose sum is σ = 206997672. Its totient is φ = 206997670.

The previous prime is 206997667. The next prime is 206997673. The reversal of 206997671 is 176799602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206997671 - 2² = 206997667 is a prime.

Together with 206997673, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206997673) 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, 103498835 + 103498836.

It is an arithmetic number, because the mean of its divisors is an integer number (103498836).

Almost surely, 2^206997671 is an apocalyptic number.

206997671 is a deficient number, since it is larger than the sum of its proper divisors (1).

206997671 is an equidigital number, since it uses as much as digits as its factorization.

206997671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 206997671 is about 14387.4136313654. The cubic root of 206997671 is about 591.5459514180.

The spelling of 206997671 in words is "two hundred six million, nine hundred ninety-seven thousand, six hundred seventy-one".