248555809 has 2 divisors, whose sum is σ = 248555810. Its totient is φ = 248555808.

The previous prime is 248555771. The next prime is 248555819. The reversal of 248555809 is 908555842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227165184 + 21390625 = 15072^2 + 4625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248555809 is a prime.

It is not a weakly prime, because it can be changed into another prime (248555819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124277904 + 124277905.

It is an arithmetic number, because the mean of its divisors is an integer number (124277905).

Almost surely, 2^248555809 is an apocalyptic number.

It is an amenable number.

248555809 is a deficient number, since it is larger than the sum of its proper divisors (1).

248555809 is an equidigital number, since it uses as much as digits as its factorization.

248555809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 46.

The square root of 248555809 is about 15765.6528250498. The cubic root of 248555809 is about 628.7451371709.

The spelling of 248555809 in words is "two hundred forty-eight million, five hundred fifty-five thousand, eight hundred nine".