3125521 has 4 divisors (see below), whose sum is σ = 3572032. Its totient is φ = 2679012.

The previous prime is 3125503. The next prime is 3125527. The reversal of 3125521 is 1255213.

3125521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 1255213 = 43 ⋅29191.

It is not a de Polignac number, because 3125521 - 2⁹ = 3125009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3125527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223245 + ... + 223258.

It is an arithmetic number, because the mean of its divisors is an integer number (893008).

Almost surely, 2^3125521 is an apocalyptic number.

It is an amenable number.

3125521 is a deficient number, since it is larger than the sum of its proper divisors (446511).

3125521 is an equidigital number, since it uses as much as digits as its factorization.

3125521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446510.

The product of its digits is 300, while the sum is 19.

The square root of 3125521 is about 1767.9143078781. The cubic root of 3125521 is about 146.2090113298.

It can be divided in two parts, 31 and 25521, that added together give a palindrome (25552).

The spelling of 3125521 in words is "three million, one hundred twenty-five thousand, five hundred twenty-one".