1812813689 has 2 divisors, whose sum is σ = 1812813690. Its totient is φ = 1812813688.

The previous prime is 1812813671. The next prime is 1812813719. The reversal of 1812813689 is 9863182181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1167247225 + 645566464 = 34165^2 + 25408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812813689 - 2²⁸ = 1544378233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1812813089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906406844 + 906406845.

It is an arithmetic number, because the mean of its divisors is an integer number (906406845).

Almost surely, 2^1812813689 is an apocalyptic number.

It is an amenable number.

1812813689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812813689 is an equidigital number, since it uses as much as digits as its factorization.

1812813689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 47.

The square root of 1812813689 is about 42577.1498458974. The cubic root of 1812813689 is about 1219.3200746443.

The spelling of 1812813689 in words is "one billion, eight hundred twelve million, eight hundred thirteen thousand, six hundred eighty-nine".