288734221 has 2 divisors, whose sum is σ = 288734222. Its totient is φ = 288734220.

The previous prime is 288734219. The next prime is 288734231. The reversal of 288734221 is 122437882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276024996 + 12709225 = 16614^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 288734221 - 2¹ = 288734219 is a prime.

Together with 288734219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (288734231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144367110 + 144367111.

It is an arithmetic number, because the mean of its divisors is an integer number (144367111).

Almost surely, 2^288734221 is an apocalyptic number.

It is an amenable number.

288734221 is a deficient number, since it is larger than the sum of its proper divisors (1).

288734221 is an equidigital number, since it uses as much as digits as its factorization.

288734221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 37.

The square root of 288734221 is about 16992.1811725276. The cubic root of 288734221 is about 660.9461643736.

The spelling of 288734221 in words is "two hundred eighty-eight million, seven hundred thirty-four thousand, two hundred twenty-one".