125443609 has 2 divisors, whose sum is σ = 125443610. Its totient is φ = 125443608.

The previous prime is 125443583. The next prime is 125443613. The reversal of 125443609 is 906344521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 23736384 = 10085^2 + 4872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125443609 is a prime.

It is not a weakly prime, because it can be changed into another prime (125443649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62721804 + 62721805.

It is an arithmetic number, because the mean of its divisors is an integer number (62721805).

Almost surely, 2^125443609 is an apocalyptic number.

It is an amenable number.

125443609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125443609 is an equidigital number, since it uses as much as digits as its factorization.

125443609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 125443609 is about 11200.1611149126. The cubic root of 125443609 is about 500.5907803489.

The spelling of 125443609 in words is "one hundred twenty-five million, four hundred forty-three thousand, six hundred nine".