1311131620615 has 16 divisors (see below), whose sum is σ = 1622406292416. Its totient is φ = 1016545248000.

The previous prime is 1311131620613. The next prime is 1311131620627. The reversal of 1311131620615 is 5160261311131.

It is not a de Polignac number, because 1311131620615 - 2¹ = 1311131620613 is a prime.

It is a super-2 number, since 2×1311131620615² (a number of 25 digits) 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 (1311131620613) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21147072 + ... + 21208981.

It is an arithmetic number, because the mean of its divisors is an integer number (101400393276).

Almost surely, 2^{1311131620615} is an apocalyptic number.

1311131620615 is a deficient number, since it is larger than the sum of its proper divisors (311274671801).

1311131620615 is a wasteful number, since it uses less digits than its factorization.

1311131620615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42356250.

The product of its (nonzero) digits is 3240, while the sum is 31.

Adding to 1311131620615 its reverse (5160261311131), we get a palindrome (6471392931746).

The spelling of 1311131620615 in words is "one trillion, three hundred eleven billion, one hundred thirty-one million, six hundred twenty thousand, six hundred fifteen".