125709 has 4 divisors (see below), whose sum is σ = 167616. Its totient is φ = 83804.

The previous prime is 125707. The next prime is 125711. The reversal of 125709 is 907521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 907521 = 3 ⋅302507.

It is an interprime number because it is at equal distance from previous prime (125707) and next prime (125711).

It is a cyclic number.

It is not a de Polignac number, because 125709 - 2¹ = 125707 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20949 + ... + 20954.

It is an arithmetic number, because the mean of its divisors is an integer number (41904).

2¹²⁵⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

125709 is a deficient number, since it is larger than the sum of its proper divisors (41907).

125709 is an equidigital number, since it uses as much as digits as its factorization.

125709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41906.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 125709 is about 354.5546502304. The cubic root of 125709 is about 50.0943551634.

The spelling of 125709 in words is "one hundred twenty-five thousand, seven hundred nine".