125122709 has 2 divisors, whose sum is σ = 125122710. Its totient is φ = 125122708.

The previous prime is 125122667. The next prime is 125122717. The reversal of 125122709 is 907221521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95452900 + 29669809 = 9770^2 + 5447^2 .

It is a cyclic number.

It is not a de Polignac number, because 125122709 - 2¹² = 125118613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125122729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62561354 + 62561355.

It is an arithmetic number, because the mean of its divisors is an integer number (62561355).

Almost surely, 2^125122709 is an apocalyptic number.

It is an amenable number.

125122709 is a deficient number, since it is larger than the sum of its proper divisors (1).

125122709 is an equidigital number, since it uses as much as digits as its factorization.

125122709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 125122709 is about 11185.8262546850. The cubic root of 125122709 is about 500.1635584914.

The spelling of 125122709 in words is "one hundred twenty-five million, one hundred twenty-two thousand, seven hundred nine".