125199609 has 16 divisors (see below), whose sum is σ = 171460800. Its totient is φ = 81213440.

The previous prime is 125199589. The next prime is 125199629. The reversal of 125199609 is 906991521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (125199589) and next prime (125199629).

It is a cyclic number.

It is not a de Polignac number, because 125199609 - 2¹² = 125195513 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (125199629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54094 + ... + 56360.

It is an arithmetic number, because the mean of its divisors is an integer number (10716300).

Almost surely, 2^125199609 is an apocalyptic number.

It is an amenable number.

125199609 is a deficient number, since it is larger than the sum of its proper divisors (46261191).

125199609 is a wasteful number, since it uses less digits than its factorization.

125199609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760.

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 125199609 is about 11189.2631124663. The cubic root of 125199609 is about 500.2660037922.

The spelling of 125199609 in words is "one hundred twenty-five million, one hundred ninety-nine thousand, six hundred nine".