125545521 has 16 divisors (see below), whose sum is σ = 177339200. Its totient is φ = 78781248.

The previous prime is 125545439. The next prime is 125545529.

125545521 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 125545521 - 2¹⁵ = 125512753 is a prime.

It is a super-2 number, since 2×125545521² = 31523355686322882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125545529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1935 + ... + 15963.

It is an arithmetic number, because the mean of its divisors is an integer number (11083700).

Almost surely, 2^125545521 is an apocalyptic number.

It is an amenable number.

125545521 is a deficient number, since it is larger than the sum of its proper divisors (51793679).

125545521 is a wasteful number, since it uses less digits than its factorization.

125545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14208.

The product of its digits is 10000, while the sum is 30.

The square root of 125545521 is about 11204.7097686642. The cubic root of 125545521 is about 500.7263057823.

Adding to 125545521 its product of digits (10000), we get a palindrome (125555521).

Subtracting from 125545521 its product of digits (10000), we obtain a palindrome (125535521).

The spelling of 125545521 in words is "one hundred twenty-five million, five hundred forty-five thousand, five hundred twenty-one".