288689561 has 2 divisors, whose sum is σ = 288689562. Its totient is φ = 288689560.

The previous prime is 288689549. The next prime is 288689579. The reversal of 288689561 is 165986882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218448400 + 70241161 = 14780^2 + 8381^2 .

It is a cyclic number.

It is not a de Polignac number, because 288689561 - 2⁶ = 288689497 is a prime.

It is not a weakly prime, because it can be changed into another prime (288689581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144344780 + 144344781.

It is an arithmetic number, because the mean of its divisors is an integer number (144344781).

Almost surely, 2^288689561 is an apocalyptic number.

It is an amenable number.

288689561 is a deficient number, since it is larger than the sum of its proper divisors (1).

288689561 is an equidigital number, since it uses as much as digits as its factorization.

288689561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 53.

The square root of 288689561 is about 16990.8669878850. The cubic root of 288689561 is about 660.9120853076.

The spelling of 288689561 in words is "two hundred eighty-eight million, six hundred eighty-nine thousand, five hundred sixty-one".