125646221 has 4 divisors (see below), whose sum is σ = 132259200. Its totient is φ = 119033244.

The previous prime is 125646203. The next prime is 125646247. The reversal of 125646221 is 122646521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125646221 - 2²² = 121451917 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 (125646251) 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, 3306461 + ... + 3306498.

It is an arithmetic number, because the mean of its divisors is an integer number (33064800).

Almost surely, 2^125646221 is an apocalyptic number.

It is an amenable number.

125646221 is a deficient number, since it is larger than the sum of its proper divisors (6612979).

125646221 is an equidigital number, since it uses as much as digits as its factorization.

125646221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6612978.

The product of its digits is 5760, while the sum is 29.

The square root of 125646221 is about 11209.2025140061. The cubic root of 125646221 is about 500.8601474442.

The spelling of 125646221 in words is "one hundred twenty-five million, six hundred forty-six thousand, two hundred twenty-one".