1605513323 has 2 divisors, whose sum is σ = 1605513324. Its totient is φ = 1605513322.

The previous prime is 1605513233. The next prime is 1605513347. The reversal of 1605513323 is 3233155061.

Together with previous prime (1605513233) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (3233155061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1605513323 - 2¹⁴ = 1605496939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1605513353) 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, 802756661 + 802756662.

It is an arithmetic number, because the mean of its divisors is an integer number (802756662).

Almost surely, 2^1605513323 is an apocalyptic number.

1605513323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605513323 is an equidigital number, since it uses as much as digits as its factorization.

1605513323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 1605513323 is about 40068.8572709530. The cubic root of 1605513323 is about 1170.9489763541.

Adding to 1605513323 its reverse (3233155061), we get a palindrome (4838668384).

The spelling of 1605513323 in words is "one billion, six hundred five million, five hundred thirteen thousand, three hundred twenty-three".