1311243534 has 48 divisors (see below), whose sum is σ = 2861548560. Its totient is φ = 433939200.

The previous prime is 1311243529. The next prime is 1311243569. The reversal of 1311243534 is 4353421131.

It is a happy number.

1311243534 is a `hidden beast` number, since 1 + 3 + 1 + 124 + 3 + 534 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1311243498 and 1311243507.

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, 2807569 + ... + 2808035.

It is an arithmetic number, because the mean of its divisors is an integer number (59615595).

Almost surely, 2^1311243534 is an apocalyptic number.

1311243534 is an abundant number, since it is smaller than the sum of its proper divisors (1550305026).

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

1311243534 is a wasteful number, since it uses less digits than its factorization.

1311243534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1262 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1311243534 is about 36211.0968350863. The cubic root of 1311243534 is about 1094.5302945745.

Adding to 1311243534 its reverse (4353421131), we get a palindrome (5664664665).

The spelling of 1311243534 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, five hundred thirty-four".