1311531342 has 48 divisors (see below), whose sum is σ = 2911359360. Its totient is φ = 393552720.

The previous prime is 1311531337. The next prime is 1311531367. The reversal of 1311531342 is 2431351131.

It is a super-3 number, since 3×1311531342³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66009 + ... + 83547.

It is an arithmetic number, because the mean of its divisors is an integer number (60653320).

Almost surely, 2^1311531342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311531342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455679680).

1311531342 is an abundant number, since it is smaller than the sum of its proper divisors (1599828018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311531342 is a wasteful number, since it uses less digits than its factorization.

1311531342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17669 (or 17658 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 1311531342 is about 36215.0706474528. The cubic root of 1311531342 is about 1094.6103690793.

Adding to 1311531342 its reverse (2431351131), we get a palindrome (3742882473).

The spelling of 1311531342 in words is "one billion, three hundred eleven million, five hundred thirty-one thousand, three hundred forty-two".