1812189317 has 2 divisors, whose sum is σ = 1812189318. Its totient is φ = 1812189316.

The previous prime is 1812189241. The next prime is 1812189349. The reversal of 1812189317 is 7139812181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1684363681 + 127825636 = 41041^2 + 11306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812189317 - 2¹⁰ = 1812188293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812189397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906094658 + 906094659.

It is an arithmetic number, because the mean of its divisors is an integer number (906094659).

Almost surely, 2^1812189317 is an apocalyptic number.

It is an amenable number.

1812189317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812189317 is an equidigital number, since it uses as much as digits as its factorization.

1812189317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 41.

The square root of 1812189317 is about 42569.8169716526. The cubic root of 1812189317 is about 1219.1800718890.

The spelling of 1812189317 in words is "one billion, eight hundred twelve million, one hundred eighty-nine thousand, three hundred seventeen".