1321155125 has 8 divisors (see below), whose sum is σ = 1648801752. Its totient is φ = 1056924000.

The previous prime is 1321155113. The next prime is 1321155127. The reversal of 1321155125 is 5215511231.

It can be written as a sum of positive squares in 4 ways, for example, as 73582084 + 1247573041 = 8578^2 + 35321^2 .

It is not a de Polignac number, because 1321155125 - 2⁶ = 1321155061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321155094 and 1321155103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321155127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5284496 + ... + 5284745.

It is an arithmetic number, because the mean of its divisors is an integer number (206100219).

Almost surely, 2^1321155125 is an apocalyptic number.

It is an amenable number.

1321155125 is a deficient number, since it is larger than the sum of its proper divisors (327646627).

1321155125 is an equidigital number, since it uses as much as digits as its factorization.

1321155125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10569256 (or 10569246 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 1321155125 is about 36347.6976574858. The cubic root of 1321155125 is about 1097.2811988690.

Adding to 1321155125 its reverse (5215511231), we get a palindrome (6536666356).

The spelling of 1321155125 in words is "one billion, three hundred twenty-one million, one hundred fifty-five thousand, one hundred twenty-five".