125707521 has 8 divisors (see below), whose sum is σ = 168930304. Its totient is φ = 83144880.

The previous prime is 125707513. The next prime is 125707523.

125707521 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125707521 - 2³ = 125707513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125707523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164590 + ... + 165351.

It is an arithmetic number, because the mean of its divisors is an integer number (21116288).

Almost surely, 2^125707521 is an apocalyptic number.

It is an amenable number.

125707521 is a deficient number, since it is larger than the sum of its proper divisors (43222783).

125707521 is a wasteful number, since it uses less digits than its factorization.

125707521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330071.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 125707521 is about 11211.9365410263. The cubic root of 125707521 is about 500.9415870479.

The spelling of 125707521 in words is "one hundred twenty-five million, seven hundred seven thousand, five hundred twenty-one".