125585521 has 4 divisors (see below), whose sum is σ = 126829044. Its totient is φ = 124342000.

The previous prime is 125585513. The next prime is 125585533.

125585521 is nontrivially palindromic in base 10.

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 124010496 + 1575025 = 11136^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 125585521 - 2³ = 125585513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125585321) 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, 621610 + ... + 621811.

It is an arithmetic number, because the mean of its divisors is an integer number (31707261).

Almost surely, 2^125585521 is an apocalyptic number.

It is an amenable number.

125585521 is a deficient number, since it is larger than the sum of its proper divisors (1243523).

125585521 is a wasteful number, since it uses less digits than its factorization.

125585521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243522.

The product of its digits is 20000, while the sum is 34.

The square root of 125585521 is about 11206.4945901919. The cubic root of 125585521 is about 500.7794788606.

Subtracting from 125585521 its product of digits (20000), we obtain a palindrome (125565521).

The spelling of 125585521 in words is "one hundred twenty-five million, five hundred eighty-five thousand, five hundred twenty-one".