125501221 has 4 divisors (see below), whose sum is σ = 125954572. Its totient is φ = 125047872.

The previous prime is 125501209. The next prime is 125501227. The reversal of 125501221 is 122105521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86750596 + 38750625 = 9314^2 + 6225^2 .

It is a cyclic number.

It is not a de Polignac number, because 125501221 - 2¹¹ = 125499173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125501227) 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 3 ways as a sum of consecutive naturals, for example, 226260 + ... + 226813.

It is an arithmetic number, because the mean of its divisors is an integer number (31488643).

Almost surely, 2^125501221 is an apocalyptic number.

It is an amenable number.

125501221 is a deficient number, since it is larger than the sum of its proper divisors (453351).

125501221 is an equidigital number, since it uses as much as digits as its factorization.

125501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453350.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 125501221 is about 11202.7327469685. The cubic root of 125501221 is about 500.6674034157.

Adding to 125501221 its reverse (122105521), we get a palindrome (247606742).

The spelling of 125501221 in words is "one hundred twenty-five million, five hundred one thousand, two hundred twenty-one".