297085561 has 2 divisors, whose sum is σ = 297085562. Its totient is φ = 297085560.

The previous prime is 297085559. The next prime is 297085567. The reversal of 297085561 is 165580792.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162409536 + 134676025 = 12744^2 + 11605^2 .

It is a cyclic number.

It is not a de Polignac number, because 297085561 - 2¹ = 297085559 is a prime.

Together with 297085559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (297085567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 148542780 + 148542781.

It is an arithmetic number, because the mean of its divisors is an integer number (148542781).

Almost surely, 2^297085561 is an apocalyptic number.

It is an amenable number.

297085561 is a deficient number, since it is larger than the sum of its proper divisors (1).

297085561 is an equidigital number, since it uses as much as digits as its factorization.

297085561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 297085561 is about 17236.1701372434. The cubic root of 297085561 is about 667.2580903663.

The spelling of 297085561 in words is "two hundred ninety-seven million, eighty-five thousand, five hundred sixty-one".