125599109 has 4 divisors (see below), whose sum is σ = 126300960. Its totient is φ = 124897260.

The previous prime is 125599093. The next prime is 125599129. The reversal of 125599109 is 901995521.

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.

It is a cyclic number.

It is not a de Polignac number, because 125599109 - 2⁴ = 125599093 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 (125599129) 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 3 ways as a sum of consecutive naturals, for example, 350657 + ... + 351014.

It is an arithmetic number, because the mean of its divisors is an integer number (31575240).

Almost surely, 2^125599109 is an apocalyptic number.

It is an amenable number.

125599109 is a deficient number, since it is larger than the sum of its proper divisors (701851).

125599109 is an equidigital number, since it uses as much as digits as its factorization.

125599109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701850.

The product of its (nonzero) digits is 36450, while the sum is 41.

The square root of 125599109 is about 11207.1008293849. The cubic root of 125599109 is about 500.7975391861.

The spelling of 125599109 in words is "one hundred twenty-five million, five hundred ninety-nine thousand, one hundred nine".