1325105521 has 4 divisors (see below), whose sum is σ = 1326496932. Its totient is φ = 1323714112.

The previous prime is 1325105519. The next prime is 1325105569. The reversal of 1325105521 is 1255015231.

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 180230625 + 1144874896 = 13425^2 + 33836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325105521 - 2¹ = 1325105519 is a prime.

It is a super-4 number, since 4×1325105521⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1325109521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694276 + ... + 696181.

It is an arithmetic number, because the mean of its divisors is an integer number (331624233).

Almost surely, 2^1325105521 is an apocalyptic number.

It is an amenable number.

1325105521 is a deficient number, since it is larger than the sum of its proper divisors (1391411).

1325105521 is an equidigital number, since it uses as much as digits as its factorization.

1325105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391410.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1325105521 is about 36401.9988599527. The cubic root of 1325105521 is about 1098.3737735757.

The spelling of 1325105521 in words is "one billion, three hundred twenty-five million, one hundred five thousand, five hundred twenty-one".