125115709 has 2 divisors, whose sum is σ = 125115710. Its totient is φ = 125115708.

The previous prime is 125115673. The next prime is 125115713. The reversal of 125115709 is 907511521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109788484 + 15327225 = 10478^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 125115709 - 2⁷ = 125115581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125115769) 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, 62557854 + 62557855.

It is an arithmetic number, because the mean of its divisors is an integer number (62557855).

Almost surely, 2^125115709 is an apocalyptic number.

It is an amenable number.

125115709 is a deficient number, since it is larger than the sum of its proper divisors (1).

125115709 is an equidigital number, since it uses as much as digits as its factorization.

125115709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 125115709 is about 11185.5133543347. The cubic root of 125115709 is about 500.1542310873.

The spelling of 125115709 in words is "one hundred twenty-five million, one hundred fifteen thousand, seven hundred nine".