125547209 has 2 divisors, whose sum is σ = 125547210. Its totient is φ = 125547208.

The previous prime is 125547173. The next prime is 125547223. The reversal of 125547209 is 902745521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125507209 + 40000 = 11203^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 125547209 - 2¹⁶ = 125481673 is a prime.

It is not a weakly prime, because it can be changed into another prime (125547239) 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 as a sum of consecutive naturals, namely, 62773604 + 62773605.

It is an arithmetic number, because the mean of its divisors is an integer number (62773605).

Almost surely, 2^125547209 is an apocalyptic number.

It is an amenable number.

125547209 is a deficient number, since it is larger than the sum of its proper divisors (1).

125547209 is an equidigital number, since it uses as much as digits as its factorization.

125547209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 125547209 is about 11204.7850938784. The cubic root of 125547209 is about 500.7285499144.

The spelling of 125547209 in words is "one hundred twenty-five million, five hundred forty-seven thousand, two hundred nine".