1311255005125 has 16 divisors (see below), whose sum is σ = 1762326729072. Its totient is φ = 968311387200.

The previous prime is 1311255005119. The next prime is 1311255005153. The reversal of 1311255005125 is 5215005521131.

It can be written as a sum of positive squares in 8 ways, for example, as 607699761601 + 703555243524 = 779551^2 + 838782^2 .

It is not a de Polignac number, because 1311255005125 - 2²⁷ = 1311120787397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403461454 + ... + 403464703.

It is an arithmetic number, because the mean of its divisors is an integer number (110145420567).

Almost surely, 2^{1311255005125} is an apocalyptic number.

It is an amenable number.

1311255005125 is a deficient number, since it is larger than the sum of its proper divisors (451071723947).

1311255005125 is an equidigital number, since it uses as much as digits as its factorization.

1311255005125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806926185 (or 806926175 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 1311255005125 in words is "one trillion, three hundred eleven billion, two hundred fifty-five million, five thousand, one hundred twenty-five".