1325101521 has 4 divisors (see below), whose sum is σ = 1766802032. Its totient is φ = 883401012.

The previous prime is 1325101511. The next prime is 1325101529. The reversal of 1325101521 is 1251015231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1251015231 = 3 ⋅417005077.

It is not a de Polignac number, because 1325101521 - 2²¹ = 1323004369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1325101529) 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 3 ways as a sum of consecutive naturals, for example, 220850251 + ... + 220850256.

It is an arithmetic number, because the mean of its divisors is an integer number (441700508).

Almost surely, 2^1325101521 is an apocalyptic number.

It is an amenable number.

1325101521 is a deficient number, since it is larger than the sum of its proper divisors (441700511).

1325101521 is an equidigital number, since it uses as much as digits as its factorization.

1325101521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441700510.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1325101521 is about 36401.9439178734. The cubic root of 1325101521 is about 1098.3726683808.

Adding to 1325101521 its reverse (1251015231), we get a palindrome (2576116752).

The spelling of 1325101521 in words is "one billion, three hundred twenty-five million, one hundred one thousand, five hundred twenty-one".