1605304505 has 16 divisors (see below), whose sum is σ = 2248404480. Its totient is φ = 1077358272.

The previous prime is 1605304469. The next prime is 1605304517. The reversal of 1605304505 is 5054035061.

It is a cyclic number.

It is not a de Polignac number, because 1605304505 - 2¹⁰ = 1605303481 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 486290 + ... + 489579.

It is an arithmetic number, because the mean of its divisors is an integer number (140525280).

Almost surely, 2^1605304505 is an apocalyptic number.

It is an amenable number.

1605304505 is a deficient number, since it is larger than the sum of its proper divisors (643099975).

1605304505 is an equidigital number, since it uses as much as digits as its factorization.

1605304505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975928.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 1605304505 is about 40066.2514468224. The cubic root of 1605304505 is about 1170.8982084115.

Adding to 1605304505 its reverse (5054035061), we get a palindrome (6659339566).

The spelling of 1605304505 in words is "one billion, six hundred five million, three hundred four thousand, five hundred five".