206391377 has 2 divisors, whose sum is σ = 206391378. Its totient is φ = 206391376.

The previous prime is 206391349. The next prime is 206391389. The reversal of 206391377 is 773193602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171060241 + 35331136 = 13079^2 + 5944^2 .

It is a cyclic number.

It is not a de Polignac number, because 206391377 - 2¹² = 206387281 is a prime.

It is a super-2 number, since 2×206391377² = 85194800999912258, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206391377.

It is not a weakly prime, because it can be changed into another prime (206391307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103195688 + 103195689.

It is an arithmetic number, because the mean of its divisors is an integer number (103195689).

Almost surely, 2^206391377 is an apocalyptic number.

It is an amenable number.

206391377 is a deficient number, since it is larger than the sum of its proper divisors (1).

206391377 is an equidigital number, since it uses as much as digits as its factorization.

206391377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 38.

The square root of 206391377 is about 14366.3278885037. The cubic root of 206391377 is about 590.9678426697.

The spelling of 206391377 in words is "two hundred six million, three hundred ninety-one thousand, three hundred seventy-seven".