248545861 has 2 divisors, whose sum is σ = 248545862. Its totient is φ = 248545860.

The previous prime is 248545799. The next prime is 248545867. The reversal of 248545861 is 168545842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133841761 + 114704100 = 11569^2 + 10710^2 .

It is a cyclic number.

It is not a de Polignac number, because 248545861 - 2²⁷ = 114328133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248545867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124272930 + 124272931.

It is an arithmetic number, because the mean of its divisors is an integer number (124272931).

Almost surely, 2^248545861 is an apocalyptic number.

It is an amenable number.

248545861 is a deficient number, since it is larger than the sum of its proper divisors (1).

248545861 is an equidigital number, since it uses as much as digits as its factorization.

248545861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 307200, while the sum is 43.

The square root of 248545861 is about 15765.3373259185. The cubic root of 248545861 is about 628.7367489273.

The spelling of 248545861 in words is "two hundred forty-eight million, five hundred forty-five thousand, eight hundred sixty-one".