125521 has 4 divisors (see below), whose sum is σ = 136944. Its totient is φ = 114100.

The previous prime is 125509. The next prime is 125527.

125521 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 125521 - 2¹³ = 117329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125495 and 125504.

It is not an unprimeable number, because it can be changed into a prime (125527) 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, 5695 + ... + 5716.

It is an arithmetic number, because the mean of its divisors is an integer number (34236).

2¹²⁵⁵²¹ is an apocalyptic number.

125521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125521 is a deficient number, since it is larger than the sum of its proper divisors (11423).

125521 is a wasteful number, since it uses less digits than its factorization.

125521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11422.

The product of its digits is 100, while the sum is 16.

The square root of 125521 is about 354.2894297040. The cubic root of 125521 is about 50.0693703772.

It can be divided in two parts, 125 and 521, that added together give a palindrome (646).

The spelling of 125521 in words is "one hundred twenty-five thousand, five hundred twenty-one".