1311242520225 has 96 divisors (see below), whose sum is σ = 2392723998720. Its totient is φ = 628309440000.

The previous prime is 1311242520191. The next prime is 1311242520227. The reversal of 1311242520225 is 5220252421131.

It is not a de Polignac number, because 1311242520225 - 2⁷ = 1311242520097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311242520192 and 1311242520201.

It is not an unprimeable number, because it can be changed into a prime (1311242520227) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 264841500 + ... + 264846450.

It is an arithmetic number, because the mean of its divisors is an integer number (24924208320).

Almost surely, 2^{1311242520225} is an apocalyptic number.

1311242520225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311242520225 is a deficient number, since it is larger than the sum of its proper divisors (1081481478495).

1311242520225 is a wasteful number, since it uses less digits than its factorization.

1311242520225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8671 (or 8666 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1311242520225 its reverse (5220252421131), we get a palindrome (6531494941356).

The spelling of 1311242520225 in words is "one trillion, three hundred eleven billion, two hundred forty-two million, five hundred twenty thousand, two hundred twenty-five".