1311321015 has 32 divisors (see below), whose sum is σ = 2336725440. Its totient is φ = 697724928.

The previous prime is 1311321007. The next prime is 1311321023. The reversal of 1311321015 is 5101231131.

It is an interprime number because it is at equal distance from previous prime (1311321007) and next prime (1311321023).

It is not a de Polignac number, because 1311321015 - 2³ = 1311321007 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 47239 + ... + 69671.

It is an arithmetic number, because the mean of its divisors is an integer number (73022670).

Almost surely, 2^1311321015 is an apocalyptic number.

1311321015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1311321015 is a deficient number, since it is larger than the sum of its proper divisors (1025404425).

1311321015 is a wasteful number, since it uses less digits than its factorization.

1311321015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880 (or 22874 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1311321015 is about 36212.1666708856. The cubic root of 1311321015 is about 1094.5518526424.

Adding to 1311321015 its reverse (5101231131), we get a palindrome (6412552146).

The spelling of 1311321015 in words is "one billion, three hundred eleven million, three hundred twenty-one thousand, fifteen".