1311322031 has 12 divisors (see below), whose sum is σ = 1393317000. Its totient is φ = 1233916848.

The previous prime is 1311322021. The next prime is 1311322049. The reversal of 1311322031 is 1302231131.

It is not a de Polignac number, because 1311322031 - 2¹⁰ = 1311321007 is a prime.

It is a super-2 number, since 2×1311322031² = 3439130937971929922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311322021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41600 + ... + 65978.

It is an arithmetic number, because the mean of its divisors is an integer number (116109750).

Almost surely, 2^1311322031 is an apocalyptic number.

1311322031 is a deficient number, since it is larger than the sum of its proper divisors (81994969).

1311322031 is a wasteful number, since it uses less digits than its factorization.

1311322031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24566 (or 24547 counting only the distinct ones).

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

The square root of 1311322031 is about 36212.1806993172. The cubic root of 1311322031 is about 1094.5521353254.

Adding to 1311322031 its reverse (1302231131), we get a palindrome (2613553162).

The spelling of 1311322031 in words is "one billion, three hundred eleven million, three hundred twenty-two thousand, thirty-one".