1311521052 has 12 divisors (see below), whose sum is σ = 3060215816. Its totient is φ = 437173680.

The previous prime is 1311521039. The next prime is 1311521059. The reversal of 1311521052 is 2501251131.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311521059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54646699 + ... + 54646722.

Almost surely, 2^1311521052 is an apocalyptic number.

1311521052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311521052 is an abundant number, since it is smaller than the sum of its proper divisors (1748694764).

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

1311521052 is a wasteful number, since it uses less digits than its factorization.

1311521052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109293428 (or 109293426 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1311521052 is about 36214.9285792475. The cubic root of 1311521052 is about 1094.6075063773.

Adding to 1311521052 its reverse (2501251131), we get a palindrome (3812772183).

The spelling of 1311521052 in words is "one billion, three hundred eleven million, five hundred twenty-one thousand, fifty-two".