1315234321531 has 24 divisors (see below), whose sum is σ = 1501857912240. Its totient is φ = 1143607476480.

The previous prime is 1315234321523. The next prime is 1315234321561. The reversal of 1315234321531 is 1351234325131.

It is not a de Polignac number, because 1315234321531 - 2³ = 1315234321523 is a prime.

It is a super-2 number, since 2×1315234321531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315234321561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403945 + ... + 1671418.

It is an arithmetic number, because the mean of its divisors is an integer number (62577413010).

Almost surely, 2^{1315234321531} is an apocalyptic number.

1315234321531 is a deficient number, since it is larger than the sum of its proper divisors (186623590709).

1315234321531 is a wasteful number, since it uses less digits than its factorization.

1315234321531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075487 (or 2075446 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

Adding to 1315234321531 its reverse (1351234325131), we get a palindrome (2666468646662).

The spelling of 1315234321531 in words is "one trillion, three hundred fifteen billion, two hundred thirty-four million, three hundred twenty-one thousand, five hundred thirty-one".