1303312321 has 4 divisors (see below), whose sum is σ = 1303404372. Its totient is φ = 1303220272.

The previous prime is 1303312313. The next prime is 1303312337. The reversal of 1303312321 is 1232133031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 470412721 + 832899600 = 21689^2 + 28860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1303312321 - 2³ = 1303312313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1303313321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19810 + ... + 54763.

It is an arithmetic number, because the mean of its divisors is an integer number (325851093).

Almost surely, 2^1303312321 is an apocalyptic number.

It is an amenable number.

1303312321 is a deficient number, since it is larger than the sum of its proper divisors (92051).

1303312321 is an equidigital number, since it uses as much as digits as its factorization.

1303312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92050.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1303312321 is about 36101.4171605493. The cubic root of 1303312321 is about 1092.3190311639.

Adding to 1303312321 its reverse (1232133031), we get a palindrome (2535445352).

The spelling of 1303312321 in words is "one billion, three hundred three million, three hundred twelve thousand, three hundred twenty-one".