547775561 has 2 divisors, whose sum is σ = 547775562. Its totient is φ = 547775560.

The previous prime is 547775507. The next prime is 547775597. The reversal of 547775561 is 165577745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300814336 + 246961225 = 17344^2 + 15715^2 .

It is a cyclic number.

It is not a de Polignac number, because 547775561 - 2⁶ = 547775497 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (547771561) 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, 273887780 + 273887781.

It is an arithmetic number, because the mean of its divisors is an integer number (273887781).

Almost surely, 2^547775561 is an apocalyptic number.

It is an amenable number.

547775561 is a deficient number, since it is larger than the sum of its proper divisors (1).

547775561 is an equidigital number, since it uses as much as digits as its factorization.

547775561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1029000, while the sum is 47.

The square root of 547775561 is about 23404.6055510449. The cubic root of 547775561 is about 818.2152143836.

The spelling of 547775561 in words is "five hundred forty-seven million, seven hundred seventy-five thousand, five hundred sixty-one".