288716621 has 2 divisors, whose sum is σ = 288716622. Its totient is φ = 288716620.

The previous prime is 288716611. The next prime is 288716641. The reversal of 288716621 is 126617882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146773225 + 141943396 = 12115^2 + 11914^2 .

It is a cyclic number.

It is not a de Polignac number, because 288716621 - 2⁶ = 288716557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (288716611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144358310 + 144358311.

It is an arithmetic number, because the mean of its divisors is an integer number (144358311).

Almost surely, 2^288716621 is an apocalyptic number.

It is an amenable number.

288716621 is a deficient number, since it is larger than the sum of its proper divisors (1).

288716621 is an equidigital number, since it uses as much as digits as its factorization.

288716621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 288716621 is about 16991.6632793850. The cubic root of 288716621 is about 660.9327346194.

The spelling of 288716621 in words is "two hundred eighty-eight million, seven hundred sixteen thousand, six hundred twenty-one".