1311531134521 has 8 divisors (see below), whose sum is σ = 1323190917864. Its totient is φ = 1299872286720.

The previous prime is 1311531134497. The next prime is 1311531134527. The reversal of 1311531134521 is 1254311351131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 105487894521 + 1206043240000 = 324789^2 + 1098200^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311531134521 - 2¹³ = 1311531126329 is a prime.

It is a super-2 number, since 2×1311531134521² (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 (1311531134527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2750881 + ... + 3192241.

It is an arithmetic number, because the mean of its divisors is an integer number (165398864733).

Almost surely, 2^{1311531134521} is an apocalyptic number.

It is an amenable number.

1311531134521 is a deficient number, since it is larger than the sum of its proper divisors (11659783343).

1311531134521 is a wasteful number, since it uses less digits than its factorization.

1311531134521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467771.

The product of its digits is 5400, while the sum is 31.

Adding to 1311531134521 its reverse (1254311351131), we get a palindrome (2565842485652).

The spelling of 1311531134521 in words is "one trillion, three hundred eleven billion, five hundred thirty-one million, one hundred thirty-four thousand, five hundred twenty-one".