1311052520 has 32 divisors (see below), whose sum is σ = 3005530920. Its totient is φ = 514525440.

The previous prime is 1311052513. The next prime is 1311052537. The reversal of 1311052520 is 252501131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1310874436 + 178084 = 36206^2 + 422^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1311052492 and 1311052501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307091 + ... + 311330.

Almost surely, 2^1311052520 is an apocalyptic number.

1311052520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311052520 is an abundant number, since it is smaller than the sum of its proper divisors (1694478400).

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

1311052520 is a wasteful number, since it uses less digits than its factorization.

1311052520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618485 (or 618481 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1311052520 is about 36208.4592326158. The cubic root of 1311052520 is about 1094.4771438166.

Adding to 1311052520 its reverse (252501131), we get a palindrome (1563553651).

The spelling of 1311052520 in words is "one billion, three hundred eleven million, fifty-two thousand, five hundred twenty".