1812164243 has 2 divisors, whose sum is σ = 1812164244. Its totient is φ = 1812164242.

The previous prime is 1812164239. The next prime is 1812164251. The reversal of 1812164243 is 3424612181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1812164243 - 2² = 1812164239 is a prime.

It is not a weakly prime, because it can be changed into another prime (1812164293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906082121 + 906082122.

It is an arithmetic number, because the mean of its divisors is an integer number (906082122).

Almost surely, 2^1812164243 is an apocalyptic number.

1812164243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812164243 is an equidigital number, since it uses as much as digits as its factorization.

1812164243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 1812164243 is about 42569.5224661964. The cubic root of 1812164243 is about 1219.1744488815.

The spelling of 1812164243 in words is "one billion, eight hundred twelve million, one hundred sixty-four thousand, two hundred forty-three".