245804809 has 2 divisors, whose sum is σ = 245804810. Its totient is φ = 245804808.

The previous prime is 245804789. The next prime is 245804837. The reversal of 245804809 is 908408542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205291584 + 40513225 = 14328^2 + 6365^2 .

It is a cyclic number.

It is not a de Polignac number, because 245804809 - 2⁵ = 245804777 is a prime.

It is not a weakly prime, because it can be changed into another prime (245804869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122902404 + 122902405.

It is an arithmetic number, because the mean of its divisors is an integer number (122902405).

Almost surely, 2^245804809 is an apocalyptic number.

It is an amenable number.

245804809 is a deficient number, since it is larger than the sum of its proper divisors (1).

245804809 is an equidigital number, since it uses as much as digits as its factorization.

245804809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 245804809 is about 15678.1634447406. The cubic root of 245804809 is about 626.4168891330.

The spelling of 245804809 in words is "two hundred forty-five million, eight hundred four thousand, eight hundred nine".