1311255525 has 24 divisors (see below), whose sum is σ = 2169798624. Its totient is φ = 698737600.

The previous prime is 1311255523. The next prime is 1311255541. The reversal of 1311255525 is 5255521131.

It is not a de Polignac number, because 1311255525 - 2¹ = 1311255523 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1311255492 and 1311255501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311255521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88930 + ... + 102620.

It is an arithmetic number, because the mean of its divisors is an integer number (90408276).

Almost surely, 2^1311255525 is an apocalyptic number.

1311255525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311255525 is a deficient number, since it is larger than the sum of its proper divisors (858543099).

1311255525 is a wasteful number, since it uses less digits than its factorization.

1311255525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14981 (or 14976 counting only the distinct ones).

The product of its digits is 7500, while the sum is 30.

The square root of 1311255525 is about 36211.2624055003. The cubic root of 1311255525 is about 1094.5336309679.

Adding to 1311255525 its reverse (5255521131), we get a palindrome (6566776656).

The spelling of 1311255525 in words is "one billion, three hundred eleven million, two hundred fifty-five thousand, five hundred twenty-five".