1320813650 has 24 divisors (see below), whose sum is σ = 2645692644. Its totient is φ = 487684800.

The previous prime is 1320813607. The next prime is 1320813661. The reversal of 1320813650 is 563180231.

It is a Cunningham number, because it is equal to 36343²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 195412441 + 1125401209 = 13979^2 + 33547^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1015361 + ... + 1016660.

Almost surely, 2^1320813650 is an apocalyptic number.

1320813650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1320813650 is an abundant number, since it is smaller than the sum of its proper divisors (1324878994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1320813650 is a wasteful number, since it uses less digits than its factorization.

1320813650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032046 (or 2032041 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1320813650 is about 36343.0000137578. Note that the first 4 decimals coincide. The cubic root of 1320813650 is about 1097.1866537302.

Adding to 1320813650 its reverse (563180231), we get a palindrome (1883993881).

The spelling of 1320813650 in words is "one billion, three hundred twenty million, eight hundred thirteen thousand, six hundred fifty".