248165809 has 2 divisors, whose sum is σ = 248165810. Its totient is φ = 248165808.

The previous prime is 248165717. The next prime is 248165833. The reversal of 248165809 is 908561842.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208513600 + 39652209 = 14440^2 + 6297^2 .

It is a cyclic number.

It is not a de Polignac number, because 248165809 - 2¹¹ = 248163761 is a prime.

It is not a weakly prime, because it can be changed into another prime (248165839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124082904 + 124082905.

It is an arithmetic number, because the mean of its divisors is an integer number (124082905).

Almost surely, 2^248165809 is an apocalyptic number.

It is an amenable number.

248165809 is a deficient number, since it is larger than the sum of its proper divisors (1).

248165809 is an equidigital number, since it uses as much as digits as its factorization.

248165809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 248165809 is about 15753.2793094009. The cubic root of 248165809 is about 628.4161178831.

It can be divided in two parts, 24816 and 5809, that added together give a square (30625 = 175²).

The spelling of 248165809 in words is "two hundred forty-eight million, one hundred sixty-five thousand, eight hundred nine".