1303323121 has 4 divisors (see below), whose sum is σ = 1303733232. Its totient is φ = 1302913012.

The previous prime is 1303323079. The next prime is 1303323143. The reversal of 1303323121 is 1213233031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1213233031 = 4639 ⋅261529.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1303323121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1303323181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200251 + ... + 206656.

It is an arithmetic number, because the mean of its divisors is an integer number (325933308).

Almost surely, 2^1303323121 is an apocalyptic number.

It is an amenable number.

1303323121 is a deficient number, since it is larger than the sum of its proper divisors (410111).

1303323121 is an equidigital number, since it uses as much as digits as its factorization.

1303323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410110.

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

The square root of 1303323121 is about 36101.5667388550. The cubic root of 1303323121 is about 1092.3220483514.

Adding to 1303323121 its reverse (1213233031), we get a palindrome (2516556152).

The spelling of 1303323121 in words is "one billion, three hundred three million, three hundred twenty-three thousand, one hundred twenty-one".