125707609 has 2 divisors, whose sum is σ = 125707610. Its totient is φ = 125707608.

The previous prime is 125707607. The next prime is 125707633. The reversal of 125707609 is 906707521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 7441984 = 10875^2 + 2728^2 .

It is a cyclic number.

It is not a de Polignac number, because 125707609 - 2¹ = 125707607 is a prime.

Together with 125707607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125707601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62853804 + 62853805.

It is an arithmetic number, because the mean of its divisors is an integer number (62853805).

Almost surely, 2^125707609 is an apocalyptic number.

It is an amenable number.

125707609 is a deficient number, since it is larger than the sum of its proper divisors (1).

125707609 is an equidigital number, since it uses as much as digits as its factorization.

125707609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 125707609 is about 11211.9404654145. The cubic root of 125707609 is about 500.9417039406.

The spelling of 125707609 in words is "one hundred twenty-five million, seven hundred seven thousand, six hundred nine".