1311330121 has 4 divisors (see below), whose sum is σ = 1311823744. Its totient is φ = 1310836500.

The previous prime is 1311330109. The next prime is 1311330133. The reversal of 1311330121 is 1210331131.

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 an interprime number because it is at equal distance from previous prime (1311330109) and next prime (1311330133).

It is a cyclic number.

It is not a de Polignac number, because 1311330121 - 2¹⁹ = 1310805833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311330095 and 1311330104.

It is not an unprimeable number, because it can be changed into a prime (1311330151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242805 + ... + 248146.

It is an arithmetic number, because the mean of its divisors is an integer number (327955936).

Almost surely, 2^1311330121 is an apocalyptic number.

It is an amenable number.

1311330121 is a deficient number, since it is larger than the sum of its proper divisors (493623).

1311330121 is an equidigital number, since it uses as much as digits as its factorization.

1311330121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493622.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1311330121 is about 36212.2924018903. The cubic root of 1311330121 is about 1094.5543862112.

Adding to 1311330121 its reverse (1210331131), we get a palindrome (2521661252).

It can be divided in two parts, 13113 and 30121, that added together give a palindrome (43234).

The spelling of 1311330121 in words is "one billion, three hundred eleven million, three hundred thirty thousand, one hundred twenty-one".