1608511603 has 4 divisors (see below), whose sum is σ = 1631166768. Its totient is φ = 1585856440.

The previous prime is 1608511591. The next prime is 1608511609. The reversal of 1608511603 is 3061158061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061158061 = 13 ⋅235473697.

It is a cyclic number.

It is not a de Polignac number, because 1608511603 - 2⁵ = 1608511571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1608511609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11327476 + ... + 11327617.

It is an arithmetic number, because the mean of its divisors is an integer number (407791692).

Almost surely, 2^1608511603 is an apocalyptic number.

1608511603 is a deficient number, since it is larger than the sum of its proper divisors (22655165).

1608511603 is an equidigital number, since it uses as much as digits as its factorization.

1608511603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22655164.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1608511603 is about 40106.2539138225. The cubic root of 1608511603 is about 1171.6774348954.

Adding to 1608511603 its reverse (3061158061), we get a palindrome (4669669664).

The spelling of 1608511603 in words is "one billion, six hundred eight million, five hundred eleven thousand, six hundred three".