288912721 has 2 divisors, whose sum is σ = 288912722. Its totient is φ = 288912720.

The previous prime is 288912707. The next prime is 288912737. The reversal of 288912721 is 127219882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158130625 + 130782096 = 12575^2 + 11436^2 .

It is a cyclic number.

It is not a de Polignac number, because 288912721 - 2⁹ = 288912209 is a prime.

It is not a weakly prime, because it can be changed into another prime (288912781) 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, 144456360 + 144456361.

It is an arithmetic number, because the mean of its divisors is an integer number (144456361).

Almost surely, 2^288912721 is an apocalyptic number.

It is an amenable number.

288912721 is a deficient number, since it is larger than the sum of its proper divisors (1).

288912721 is an equidigital number, since it uses as much as digits as its factorization.

288912721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 288912721 is about 16997.4327767460. The cubic root of 288912721 is about 661.0823387259.

The spelling of 288912721 in words is "two hundred eighty-eight million, nine hundred twelve thousand, seven hundred twenty-one".