206778071 has 2 divisors, whose sum is σ = 206778072. Its totient is φ = 206778070.

The previous prime is 206778053. The next prime is 206778079. The reversal of 206778071 is 170877602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206778071 - 2²² = 202583767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206778079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103389035 + 103389036.

It is an arithmetic number, because the mean of its divisors is an integer number (103389036).

Almost surely, 2^206778071 is an apocalyptic number.

206778071 is a deficient number, since it is larger than the sum of its proper divisors (1).

206778071 is an equidigital number, since it uses as much as digits as its factorization.

206778071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 206778071 is about 14379.7799357292. The cubic root of 206778071 is about 591.3366906812.

The spelling of 206778071 in words is "two hundred six million, seven hundred seventy-eight thousand, seventy-one".