125739709 has 2 divisors, whose sum is σ = 125739710. Its totient is φ = 125739708.

The previous prime is 125739707. The next prime is 125739749. The reversal of 125739709 is 907937521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 61387225 = 8022^2 + 7835^2 .

It is an emirp because it is prime and its reverse (907937521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125739709 - 2¹ = 125739707 is a prime.

Together with 125739707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125739707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62869854 + 62869855.

It is an arithmetic number, because the mean of its divisors is an integer number (62869855).

Almost surely, 2^125739709 is an apocalyptic number.

It is an amenable number.

125739709 is a deficient number, since it is larger than the sum of its proper divisors (1).

125739709 is an equidigital number, since it uses as much as digits as its factorization.

125739709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 125739709 is about 11213.3718836040. The cubic root of 125739709 is about 500.9843395463.

The spelling of 125739709 in words is "one hundred twenty-five million, seven hundred thirty-nine thousand, seven hundred nine".