1320313121 has 4 divisors (see below), whose sum is σ = 1336220592. Its totient is φ = 1304405652.

The previous prime is 1320313103. The next prime is 1320313123. The reversal of 1320313121 is 1213130231.

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.

It is a cyclic number.

It is not a de Polignac number, because 1320313121 - 2²⁶ = 1253204257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320313121.

It is not an unprimeable number, because it can be changed into a prime (1320313123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7953611 + ... + 7953776.

It is an arithmetic number, because the mean of its divisors is an integer number (334055148).

Almost surely, 2^1320313121 is an apocalyptic number.

It is an amenable number.

1320313121 is a deficient number, since it is larger than the sum of its proper divisors (15907471).

1320313121 is an equidigital number, since it uses as much as digits as its factorization.

1320313121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15907470.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1320313121 is about 36336.1131795904. The cubic root of 1320313121 is about 1097.0480414124.

Adding to 1320313121 its reverse (1213130231), we get a palindrome (2533443352).

The spelling of 1320313121 in words is "one billion, three hundred twenty million, three hundred thirteen thousand, one hundred twenty-one".