273161561 has 2 divisors, whose sum is σ = 273161562. Its totient is φ = 273161560.

The previous prime is 273161519. The next prime is 273161569. The reversal of 273161561 is 165161372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261016336 + 12145225 = 16156^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 273161561 - 2¹⁴ = 273145177 is a prime.

It is not a weakly prime, because it can be changed into another prime (273161569) 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, 136580780 + 136580781.

It is an arithmetic number, because the mean of its divisors is an integer number (136580781).

Almost surely, 2^273161561 is an apocalyptic number.

It is an amenable number.

273161561 is a deficient number, since it is larger than the sum of its proper divisors (1).

273161561 is an equidigital number, since it uses as much as digits as its factorization.

273161561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 273161561 is about 16527.5999770082. The cubic root of 273161561 is about 648.8433560459.

The spelling of 273161561 in words is "two hundred seventy-three million, one hundred sixty-one thousand, five hundred sixty-one".