1816652489 has 2 divisors, whose sum is σ = 1816652490. Its totient is φ = 1816652488.

The previous prime is 1816652473. The next prime is 1816652531. The reversal of 1816652489 is 9842566181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1070925625 + 745726864 = 32725^2 + 27308^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816652489 - 2⁴ = 1816652473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1816652429) 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, 908326244 + 908326245.

It is an arithmetic number, because the mean of its divisors is an integer number (908326245).

Almost surely, 2^1816652489 is an apocalyptic number.

It is an amenable number.

1816652489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816652489 is an equidigital number, since it uses as much as digits as its factorization.

1816652489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The square root of 1816652489 is about 42622.2065242990. The cubic root of 1816652489 is about 1220.1801420368.

The spelling of 1816652489 in words is "one billion, eight hundred sixteen million, six hundred fifty-two thousand, four hundred eighty-nine".