125972221 has 2 divisors, whose sum is σ = 125972222. Its totient is φ = 125972220.

The previous prime is 125972207. The next prime is 125972233. The reversal of 125972221 is 122279521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106708900 + 19263321 = 10330^2 + 4389^2 .

It is a cyclic number.

It is not a de Polignac number, because 125972221 - 2⁹ = 125971709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125972321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62986110 + 62986111.

It is an arithmetic number, because the mean of its divisors is an integer number (62986111).

Almost surely, 2^125972221 is an apocalyptic number.

It is an amenable number.

125972221 is a deficient number, since it is larger than the sum of its proper divisors (1).

125972221 is an equidigital number, since it uses as much as digits as its factorization.

125972221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 125972221 is about 11223.7347171073. The cubic root of 125972221 is about 501.2929483539.

The spelling of 125972221 in words is "one hundred twenty-five million, nine hundred seventy-two thousand, two hundred twenty-one".