245843506409 has 2 divisors, whose sum is σ = 245843506410. Its totient is φ = 245843506408.

The previous prime is 245843506399. The next prime is 245843506453. The reversal of 245843506409 is 904605348542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245671896409 + 171610000 = 495653^2 + 13100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245843506409 is a prime.

It is not a weakly prime, because it can be changed into another prime (245843506459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122921753204 + 122921753205.

It is an arithmetic number, because the mean of its divisors is an integer number (122921753205).

Almost surely, 2^245843506409 is an apocalyptic number.

It is an amenable number.

245843506409 is a deficient number, since it is larger than the sum of its proper divisors (1).

245843506409 is an equidigital number, since it uses as much as digits as its factorization.

245843506409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 245843506409 in words is "two hundred forty-five billion, eight hundred forty-three million, five hundred six thousand, four hundred nine".