248559721 has 2 divisors, whose sum is σ = 248559722. Its totient is φ = 248559720.

The previous prime is 248559713. The next prime is 248559797. The reversal of 248559721 is 127955842.

248559721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243984400 + 4575321 = 15620^2 + 2139^2 .

It is a cyclic number.

It is not a de Polignac number, because 248559721 - 2³ = 248559713 is a prime.

It is not a weakly prime, because it can be changed into another prime (248959721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124279860 + 124279861.

It is an arithmetic number, because the mean of its divisors is an integer number (124279861).

Almost surely, 2^248559721 is an apocalyptic number.

It is an amenable number.

248559721 is a deficient number, since it is larger than the sum of its proper divisors (1).

248559721 is an equidigital number, since it uses as much as digits as its factorization.

248559721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 248559721 is about 15765.7768917361. The cubic root of 248559721 is about 628.7484357435.

The spelling of 248559721 in words is "two hundred forty-eight million, five hundred fifty-nine thousand, seven hundred twenty-one".