1131320225257 has 4 divisors (see below), whose sum is σ = 1132814704516. Its totient is φ = 1129825746000.

The previous prime is 1131320225251. The next prime is 1131320225293. The reversal of 1131320225257 is 7525220231311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 552448806361 + 578871418896 = 743269^2 + 760836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131320225257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131320225251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747238494 + ... + 747240007.

It is an arithmetic number, because the mean of its divisors is an integer number (283203676129).

Almost surely, 2^{1131320225257} is an apocalyptic number.

It is an amenable number.

1131320225257 is a deficient number, since it is larger than the sum of its proper divisors (1494479259).

1131320225257 is an equidigital number, since it uses as much as digits as its factorization.

1131320225257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494479258.

The product of its (nonzero) digits is 25200, while the sum is 34.

Adding to 1131320225257 its reverse (7525220231311), we get a palindrome (8656540456568).

The spelling of 1131320225257 in words is "one trillion, one hundred thirty-one billion, three hundred twenty million, two hundred twenty-five thousand, two hundred fifty-seven".