1816537589 has 2 divisors, whose sum is σ = 1816537590. Its totient is φ = 1816537588.

The previous prime is 1816537577. The next prime is 1816537637. The reversal of 1816537589 is 9857356181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1439595364 + 376942225 = 37942^2 + 19415^2 .

It is an emirp because it is prime and its reverse (9857356181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1816537589 - 2¹² = 1816533493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1816537589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816537519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908268794 + 908268795.

It is an arithmetic number, because the mean of its divisors is an integer number (908268795).

Almost surely, 2^1816537589 is an apocalyptic number.

It is an amenable number.

1816537589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816537589 is an equidigital number, since it uses as much as digits as its factorization.

1816537589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 53.

The square root of 1816537589 is about 42620.8586140636. The cubic root of 1816537589 is about 1220.1544167619.

The spelling of 1816537589 in words is "one billion, eight hundred sixteen million, five hundred thirty-seven thousand, five hundred eighty-nine".