125821171 has 6 divisors (see below), whose sum is σ = 146363460. Its totient is φ = 107846676.

The previous prime is 125821151. The next prime is 125821181. The reversal of 125821171 is 171128521.

It is not a de Polignac number, because 125821171 - 2¹¹ = 125819123 is a prime.

It is a super-2 number, since 2×125821171² = 31661934143622482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125821141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1283841 + ... + 1283938.

It is an arithmetic number, because the mean of its divisors is an integer number (24393910).

Almost surely, 2^125821171 is an apocalyptic number.

125821171 is a deficient number, since it is larger than the sum of its proper divisors (20542289).

125821171 is an equidigital number, since it uses as much as digits as its factorization.

125821171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567793 (or 2567786 counting only the distinct ones).

The product of its digits is 1120, while the sum is 28.

The square root of 125821171 is about 11217.0036551657. The cubic root of 125821171 is about 501.0925057902.

Adding to 125821171 its reverse (171128521), we get a palindrome (296949692).

The spelling of 125821171 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, one hundred seventy-one".