1812664709 has 2 divisors, whose sum is σ = 1812664710. Its totient is φ = 1812664708.

The previous prime is 1812664663. The next prime is 1812664751. The reversal of 1812664709 is 9074662181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1796488225 + 16176484 = 42385^2 + 4022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812664709 - 2⁸ = 1812664453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1812664709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812664769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906332354 + 906332355.

It is an arithmetic number, because the mean of its divisors is an integer number (906332355).

Almost surely, 2^1812664709 is an apocalyptic number.

It is an amenable number.

1812664709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812664709 is an equidigital number, since it uses as much as digits as its factorization.

1812664709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 1812664709 is about 42575.4002799739. The cubic root of 1812664709 is about 1219.2866718219.

The spelling of 1812664709 in words is "one billion, eight hundred twelve million, six hundred sixty-four thousand, seven hundred nine".