248945591 has 2 divisors, whose sum is σ = 248945592. Its totient is φ = 248945590.

The previous prime is 248945573. The next prime is 248945623. The reversal of 248945591 is 195549842.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248945591 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248935591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124472795 + 124472796.

It is an arithmetic number, because the mean of its divisors is an integer number (124472796).

Almost surely, 2^248945591 is an apocalyptic number.

248945591 is a deficient number, since it is larger than the sum of its proper divisors (1).

248945591 is an equidigital number, since it uses as much as digits as its factorization.

248945591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 47.

The square root of 248945591 is about 15778.0097287332. The cubic root of 248945591 is about 629.0736288452.

The spelling of 248945591 in words is "two hundred forty-eight million, nine hundred forty-five thousand, five hundred ninety-one".