1321603616 has 24 divisors (see below), whose sum is σ = 2602877004. Its totient is φ = 660555520.

The previous prime is 1321603597. The next prime is 1321603639. The reversal of 1321603616 is 6163061231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1320595600 + 1008016 = 36340^2 + 1004^2 .

It is a super-2 number, since 2×1321603616² = 3493272235648550912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104786 + ... + 116718.

Almost surely, 2^1321603616 is an apocalyptic number.

1321603616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1321603616 is a deficient number, since it is larger than the sum of its proper divisors (1281273388).

1321603616 is a wasteful number, since it uses less digits than its factorization.

1321603616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15404 (or 15396 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1321603616 is about 36353.8665894015. The cubic root of 1321603616 is about 1097.4053490809.

Adding to 1321603616 its reverse (6163061231), we get a palindrome (7484664847).

The spelling of 1321603616 in words is "one billion, three hundred twenty-one million, six hundred three thousand, six hundred sixteen".