125661709 has 2 divisors, whose sum is σ = 125661710. Its totient is φ = 125661708.

The previous prime is 125661703. The next prime is 125661737. The reversal of 125661709 is 907166521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124947684 + 714025 = 11178^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 125661709 - 2⁵ = 125661677 is a prime.

It is equal to p_7145569 and since 125661709 and 7145569 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125661703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62830854 + 62830855.

It is an arithmetic number, because the mean of its divisors is an integer number (62830855).

Almost surely, 2^125661709 is an apocalyptic number.

It is an amenable number.

125661709 is a deficient number, since it is larger than the sum of its proper divisors (1).

125661709 is an equidigital number, since it uses as much as digits as its factorization.

125661709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 125661709 is about 11209.8933536408. The cubic root of 125661709 is about 500.8807263978.

The spelling of 125661709 in words is "one hundred twenty-five million, six hundred sixty-one thousand, seven hundred nine".