125408309 has 12 divisors (see below), whose sum is σ = 136889856. Its totient is φ = 114830352.

The previous prime is 125408279. The next prime is 125408317. The reversal of 125408309 is 903804521.

It is not a de Polignac number, because 125408309 - 2¹⁶ = 125342773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125408509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18542 + ... + 24384.

It is an arithmetic number, because the mean of its divisors is an integer number (11407488).

Almost surely, 2^125408309 is an apocalyptic number.

It is an amenable number.

125408309 is a deficient number, since it is larger than the sum of its proper divisors (11481547).

125408309 is a wasteful number, since it uses less digits than its factorization.

125408309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996 (or 5983 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 125408309 is about 11198.5851338462. The cubic root of 125408309 is about 500.5438203045.

The spelling of 125408309 in words is "one hundred twenty-five million, four hundred eight thousand, three hundred nine".