1031321320 has 64 divisors (see below), whose sum is σ = 2484723600. Its totient is φ = 383877120.

The previous prime is 1031321309. The next prime is 1031321321. The reversal of 1031321320 is 231231301.

It can be written as a sum of positive squares in 8 ways, for example, as 667808964 + 363512356 = 25842^2 + 19066^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1031321294 and 1031321303.

It is not an unprimeable number, because it can be changed into a prime (1031321321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52000 + ... + 69040.

Almost surely, 2^1031321320 is an apocalyptic number.

1031321320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1031321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242361800).

1031321320 is an abundant number, since it is smaller than the sum of its proper divisors (1453402280).

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

1031321320 is a wasteful number, since it uses less digits than its factorization.

1031321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17158 (or 17154 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1031321320 is about 32114.1918783581. The cubic root of 1031321320 is about 1010.3332952238. Note that the first 3 decimals are identical.

Adding to 1031321320 its reverse (231231301), we get a palindrome (1262552621).

The spelling of 1031321320 in words is "one billion, thirty-one million, three hundred twenty-one thousand, three hundred twenty".