1818942869 has 2 divisors, whose sum is σ = 1818942870. Its totient is φ = 1818942868.

The previous prime is 1818942859. The next prime is 1818942893. The reversal of 1818942869 is 9682498181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1367890225 + 451052644 = 36985^2 + 21238^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818942869 - 2¹² = 1818938773 is a prime.

It is a super-2 number, since 2×1818942869² = 6617106321371902322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818942859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909471434 + 909471435.

It is an arithmetic number, because the mean of its divisors is an integer number (909471435).

Almost surely, 2^1818942869 is an apocalyptic number.

It is an amenable number.

1818942869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818942869 is an equidigital number, since it uses as much as digits as its factorization.

1818942869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 56.

The square root of 1818942869 is about 42649.0664493374. The cubic root of 1818942869 is about 1220.6927153095.

The spelling of 1818942869 in words is "one billion, eight hundred eighteen million, nine hundred forty-two thousand, eight hundred sixty-nine".