1320320331 has 64 divisors (see below), whose sum is σ = 2193454080. Its totient is φ = 787903200.

The previous prime is 1320320329. The next prime is 1320320347. The reversal of 1320320331 is 1330230231.

1320320331 = T₆₀₆₃ + T₆₀₆₄ + ... + T₆₁₃₃.

1320320331 is a `hidden beast` number, since 13 + 2 + 0 + 320 + 331 = 666.

It is not a de Polignac number, because 1320320331 - 2¹ = 1320320329 is a prime.

It is a super-2 number, since 2×1320320331² = 3486491552903899122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1320327331) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1707661 + ... + 1708433.

It is an arithmetic number, because the mean of its divisors is an integer number (34272720).

Almost surely, 2^1320320331 is an apocalyptic number.

1320320331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320320331 is a deficient number, since it is larger than the sum of its proper divisors (873133749).

1320320331 is an frugal number, since it uses more digits than its factorization.

1320320331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 1320320331 is about 36336.2123920477. The cubic root of 1320320331 is about 1097.0500383382.

Adding to 1320320331 its reverse (1330230231), we get a palindrome (2650550562).

The spelling of 1320320331 in words is "one billion, three hundred twenty million, three hundred twenty thousand, three hundred thirty-one".