125686241 has 4 divisors (see below), whose sum is σ = 125712132. Its totient is φ = 125660352.

The previous prime is 125686229. The next prime is 125686271. The reversal of 125686241 is 142686521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142686521 = 31 ⋅4602791.

It can be written as a sum of positive squares in 2 ways, for example, as 7507600 + 118178641 = 2740^2 + 10871^2 .

It is a cyclic number.

It is not a de Polignac number, because 125686241 - 2⁶ = 125686177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125686271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3236 + ... + 16181.

It is an arithmetic number, because the mean of its divisors is an integer number (31428033).

It is a Poulet number, since it divides 2^125686240-1.

Almost surely, 2^125686241 is an apocalyptic number.

125686241 is the 6473-rd octagonal number.

It is an amenable number.

125686241 is a deficient number, since it is larger than the sum of its proper divisors (25891).

125686241 is an equidigital number, since it uses as much as digits as its factorization.

125686241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25890.

The product of its digits is 23040, while the sum is 35.

The square root of 125686241 is about 11210.9875122578. The cubic root of 125686241 is about 500.9133186822.

The spelling of 125686241 in words is "one hundred twenty-five million, six hundred eighty-six thousand, two hundred forty-one".