1816819793 has 2 divisors, whose sum is σ = 1816819794. Its totient is φ = 1816819792.

The previous prime is 1816819783. The next prime is 1816819853. The reversal of 1816819793 is 3979186181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1675019329 + 141800464 = 40927^2 + 11908^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816819793 - 2¹⁰ = 1816818769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1816819783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908409896 + 908409897.

It is an arithmetic number, because the mean of its divisors is an integer number (908409897).

Almost surely, 2^1816819793 is an apocalyptic number.

It is an amenable number.

1816819793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816819793 is an equidigital number, since it uses as much as digits as its factorization.

1816819793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 53.

The square root of 1816819793 is about 42624.1691180016. The cubic root of 1816819793 is about 1220.2175982470.

The spelling of 1816819793 in words is "one billion, eight hundred sixteen million, eight hundred nineteen thousand, seven hundred ninety-three".