1323135725 has 48 divisors (see below), whose sum is σ = 1738134288. Its totient is φ = 998000640.

The previous prime is 1323135713. The next prime is 1323135727. The reversal of 1323135725 is 5275313231.

It can be written as a sum of positive squares in 24 ways, for example, as 63027721 + 1260108004 = 7939^2 + 35498^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1323135725 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1323135691 and 1323135700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323135727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6716327 + ... + 6716523.

It is an arithmetic number, because the mean of its divisors is an integer number (36211131).

Almost surely, 2^1323135725 is an apocalyptic number.

It is an amenable number.

1323135725 is a deficient number, since it is larger than the sum of its proper divisors (414998563).

1323135725 is a wasteful number, since it uses less digits than its factorization.

1323135725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 429 counting only the distinct ones).

The product of its digits is 18900, while the sum is 32.

The square root of 1323135725 is about 36374.9326459858. The cubic root of 1323135725 is about 1097.8292521063.

Adding to 1323135725 its reverse (5275313231), we get a palindrome (6598448956).

The spelling of 1323135725 in words is "one billion, three hundred twenty-three million, one hundred thirty-five thousand, seven hundred twenty-five".