1311245121525 has 24 divisors (see below), whose sum is σ = 2167958875680. Its totient is φ = 699319890240.

The previous prime is 1311245121491. The next prime is 1311245121553. The reversal of 1311245121525 is 5251215421131.

It is not a de Polignac number, because 1311245121525 - 2¹⁵ = 1311245088757 is a prime.

It is a super-2 number, since 2×1311245121525² (a number of 25 digits) contains 22 as substring.

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, 7854574 + ... + 8019776.

It is an arithmetic number, because the mean of its divisors is an integer number (90331619820).

Almost surely, 2^{1311245121525} is an apocalyptic number.

1311245121525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311245121525 is a deficient number, since it is larger than the sum of its proper divisors (856713754155).

1311245121525 is a wasteful number, since it uses less digits than its factorization.

1311245121525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271045 (or 271040 counting only the distinct ones).

The product of its digits is 12000, while the sum is 33.

The spelling of 1311245121525 in words is "one trillion, three hundred eleven billion, two hundred forty-five million, one hundred twenty-one thousand, five hundred twenty-five".