125000009 has 8 divisors (see below), whose sum is σ = 130587072. Its totient is φ = 119425680.

The previous prime is 125000003. The next prime is 125000077. The reversal of 125000009 is 900000521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125000009 - 2¹⁶ = 124934473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125000003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20822 + ... + 26144.

It is an arithmetic number, because the mean of its divisors is an integer number (16323384).

Almost surely, 2^125000009 is an apocalyptic number.

It is an amenable number.

125000009 is a deficient number, since it is larger than the sum of its proper divisors (5587063).

125000009 is a wasteful number, since it uses less digits than its factorization.

125000009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6367.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 125000009 is about 11180.3402899912. The cubic root of 125000009 is about 500.0000120000. Note that the first 4 decimals are identical.

The spelling of 125000009 in words is "one hundred twenty-five million, nine", and thus it is an aban number.