125725609 has 2 divisors, whose sum is σ = 125725610. Its totient is φ = 125725608.

The previous prime is 125725573. The next prime is 125725631. The reversal of 125725609 is 906527521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124813584 + 912025 = 11172^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 125725609 - 2¹⁵ = 125692841 is a prime.

It is not a weakly prime, because it can be changed into another prime (125725669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62862804 + 62862805.

It is an arithmetic number, because the mean of its divisors is an integer number (62862805).

Almost surely, 2^125725609 is an apocalyptic number.

It is an amenable number.

125725609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125725609 is an equidigital number, since it uses as much as digits as its factorization.

125725609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 125725609 is about 11212.7431523245. The cubic root of 125725609 is about 500.9656126506.

It can be divided in two parts, 12572 and 5609, that added together give a palindrome (18181).

The spelling of 125725609 in words is "one hundred twenty-five million, seven hundred twenty-five thousand, six hundred nine".