1311310331 has 4 divisors (see below), whose sum is σ = 1311617712. Its totient is φ = 1311002952.

The previous prime is 1311310321. The next prime is 1311310333. The reversal of 1311310331 is 1330131131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311310331 - 2⁶ = 1311310267 is a prime.

It is a super-2 number, since 2×1311310331² = 3439069568374659122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311310333) 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, 147200 + ... + 155853.

It is an arithmetic number, because the mean of its divisors is an integer number (327904428).

Almost surely, 2^1311310331 is an apocalyptic number.

1311310331 is a deficient number, since it is larger than the sum of its proper divisors (307381).

1311310331 is an equidigital number, since it uses as much as digits as its factorization.

1311310331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307380.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 1311310331 is about 36212.0191511051. The cubic root of 1311310331 is about 1094.5488800105.

Adding to 1311310331 its reverse (1330131131), we get a palindrome (2641441462).

The spelling of 1311310331 in words is "one billion, three hundred eleven million, three hundred ten thousand, three hundred thirty-one".