125831161 has 8 divisors (see below), whose sum is σ = 133790184. Its totient is φ = 117934080.

The previous prime is 125831143. The next prime is 125831171. The reversal of 125831161 is 161138521.

It can be written as a sum of positive squares in 4 ways, for example, as 77792400 + 48038761 = 8820^2 + 6931^2 .

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 125831161 - 2¹⁷ = 125700089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125831171) 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, 11260 + ... + 19453.

It is an arithmetic number, because the mean of its divisors is an integer number (16723773).

Almost surely, 2^125831161 is an apocalyptic number.

It is an amenable number.

125831161 is a deficient number, since it is larger than the sum of its proper divisors (7959023).

125831161 is a wasteful number, since it uses less digits than its factorization.

125831161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30971.

The product of its digits is 1440, while the sum is 28.

The square root of 125831161 is about 11217.4489524134. The cubic root of 125831161 is about 501.1057674208.

Adding to 125831161 its reverse (161138521), we get a palindrome (286969682).

The spelling of 125831161 in words is "one hundred twenty-five million, eight hundred thirty-one thousand, one hundred sixty-one".