206876561 has 2 divisors, whose sum is σ = 206876562. Its totient is φ = 206876560.

The previous prime is 206876533. The next prime is 206876567. The reversal of 206876561 is 165678602.

206876561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159542161 + 47334400 = 12631^2 + 6880^2 .

It is a cyclic number.

It is not a de Polignac number, because 206876561 - 2⁶ = 206876497 is a prime.

It is a super-2 number, since 2×206876561² = 85595822982373442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206876567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103438280 + 103438281.

It is an arithmetic number, because the mean of its divisors is an integer number (103438281).

Almost surely, 2^206876561 is an apocalyptic number.

It is an amenable number.

206876561 is a deficient number, since it is larger than the sum of its proper divisors (1).

206876561 is an equidigital number, since it uses as much as digits as its factorization.

206876561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 206876561 is about 14383.2041284270. The cubic root of 206876561 is about 591.4305618639.

The spelling of 206876561 in words is "two hundred six million, eight hundred seventy-six thousand, five hundred sixty-one".