1809235364459 has 2 divisors, whose sum is σ = 1809235364460. Its totient is φ = 1809235364458.

The previous prime is 1809235364429. The next prime is 1809235364539. The reversal of 1809235364459 is 9544635329081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1809235364459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1809235364398 and 1809235364407.

It is not a weakly prime, because it can be changed into another prime (1809235364429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904617682229 + 904617682230.

It is an arithmetic number, because the mean of its divisors is an integer number (904617682230).

Almost surely, 2^{1809235364459} is an apocalyptic number.

1809235364459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809235364459 is an equidigital number, since it uses as much as digits as its factorization.

1809235364459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27993600, while the sum is 59.

The spelling of 1809235364459 in words is "one trillion, eight hundred nine billion, two hundred thirty-five million, three hundred sixty-four thousand, four hundred fifty-nine".