206081761 has 2 divisors, whose sum is σ = 206081762. Its totient is φ = 206081760.

The previous prime is 206081737. The next prime is 206081789. The reversal of 206081761 is 167180602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112360000 + 93721761 = 10600^2 + 9681^2 .

It is a cyclic number.

It is not a de Polignac number, because 206081761 - 2²⁷ = 71864033 is a prime.

It is a super-2 number, since 2×206081761² = 84939384433722242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206081731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103040880 + 103040881.

It is an arithmetic number, because the mean of its divisors is an integer number (103040881).

Almost surely, 2^206081761 is an apocalyptic number.

It is an amenable number.

206081761 is a deficient number, since it is larger than the sum of its proper divisors (1).

206081761 is an equidigital number, since it uses as much as digits as its factorization.

206081761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 206081761 is about 14355.5480912433. The cubic root of 206081761 is about 590.6721832391.

The spelling of 206081761 in words is "two hundred six million, eighty-one thousand, seven hundred sixty-one".