1311242520525 has 48 divisors (see below), whose sum is σ = 2518240810368. Its totient is φ = 589598496000.

The previous prime is 1311242520509. The next prime is 1311242520527. The reversal of 1311242520525 is 5250252421131.

It is not a de Polignac number, because 1311242520525 - 2⁴ = 1311242520509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311242520527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20440146 + ... + 20504195.

It is an arithmetic number, because the mean of its divisors is an integer number (52463350216).

Almost surely, 2^{1311242520525} is an apocalyptic number.

1311242520525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311242520525 is a deficient number, since it is larger than the sum of its proper divisors (1206998289843).

1311242520525 is a wasteful number, since it uses less digits than its factorization.

1311242520525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40944422 (or 40944417 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 1311242520525 its reverse (5250252421131), we get a palindrome (6561494941656).

The spelling of 1311242520525 in words is "one trillion, three hundred eleven billion, two hundred forty-two million, five hundred twenty thousand, five hundred twenty-five".