125867521 has 8 divisors (see below), whose sum is σ = 136057320. Its totient is φ = 115750272.

The previous prime is 125867519. The next prime is 125867531. The reversal of 125867521 is 125768521.

It can be written as a sum of positive squares in 4 ways, for example, as 3101121 + 122766400 = 1761^2 + 11080^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 125867521 - 2¹ = 125867519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125867531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14500 + ... + 21493.

It is an arithmetic number, because the mean of its divisors is an integer number (17007165).

Almost surely, 2^125867521 is an apocalyptic number.

It is an amenable number.

125867521 is a deficient number, since it is larger than the sum of its proper divisors (10189799).

125867521 is a wasteful number, since it uses less digits than its factorization.

125867521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36275.

The product of its digits is 33600, while the sum is 37.

The square root of 125867521 is about 11219.0695246977. The cubic root of 125867521 is about 501.1540290513.

The spelling of 125867521 in words is "one hundred twenty-five million, eight hundred sixty-seven thousand, five hundred twenty-one".