1325128529 has 4 divisors (see below), whose sum is σ = 1403077284. Its totient is φ = 1247179776.

The previous prime is 1325128517. The next prime is 1325128531. The reversal of 1325128529 is 9258215231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9258215231 = 23 ⋅402531097.

It can be written as a sum of positive squares in 2 ways, for example, as 1184942929 + 140185600 = 34423^2 + 11840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1325128529 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 = 1325128492 and 1325128501.

It is not an unprimeable number, because it can be changed into a prime (1325128589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38974352 + ... + 38974385.

It is an arithmetic number, because the mean of its divisors is an integer number (350769321).

Almost surely, 2^1325128529 is an apocalyptic number.

It is an amenable number.

1325128529 is a deficient number, since it is larger than the sum of its proper divisors (77948755).

1325128529 is an equidigital number, since it uses as much as digits as its factorization.

1325128529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77948754.

The product of its digits is 43200, while the sum is 38.

The square root of 1325128529 is about 36402.3148851828. The cubic root of 1325128529 is about 1098.3801306135.

The spelling of 1325128529 in words is "one billion, three hundred twenty-five million, one hundred twenty-eight thousand, five hundred twenty-nine".