1318128425 has 6 divisors (see below), whose sum is σ = 1634479278. Its totient is φ = 1054502720.

The previous prime is 1318128421. The next prime is 1318128431. The reversal of 1318128425 is 5248218131.

It can be written as a sum of positive squares in 3 ways, for example, as 339001744 + 979126681 = 18412^2 + 31291^2 .

It is not a de Polignac number, because 1318128425 - 2² = 1318128421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318128421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26362544 + ... + 26362593.

It is an arithmetic number, because the mean of its divisors is an integer number (272413213).

Almost surely, 2^1318128425 is an apocalyptic number.

It is an amenable number.

1318128425 is a deficient number, since it is larger than the sum of its proper divisors (316350853).

1318128425 is an equidigital number, since it uses as much as digits as its factorization.

1318128425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52725147 (or 52725142 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 1318128425 is about 36306.0384096089. The cubic root of 1318128425 is about 1096.4426194663.

The spelling of 1318128425 in words is "one billion, three hundred eighteen million, one hundred twenty-eight thousand, four hundred twenty-five".