248845721 has 2 divisors, whose sum is σ = 248845722. Its totient is φ = 248845720.

The previous prime is 248845673. The next prime is 248845733. The reversal of 248845721 is 127548842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214212496 + 34633225 = 14636^2 + 5885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248845721 is a prime.

It is not a weakly prime, because it can be changed into another prime (248845741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124422860 + 124422861.

It is an arithmetic number, because the mean of its divisors is an integer number (124422861).

Almost surely, 2^248845721 is an apocalyptic number.

It is an amenable number.

248845721 is a deficient number, since it is larger than the sum of its proper divisors (1).

248845721 is an equidigital number, since it uses as much as digits as its factorization.

248845721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 143360, while the sum is 41.

The square root of 248845721 is about 15774.8445634180. The cubic root of 248845721 is about 628.9894953521.

The spelling of 248845721 in words is "two hundred forty-eight million, eight hundred forty-five thousand, seven hundred twenty-one".