125608009 has 4 divisors (see below), whose sum is σ = 125828560. Its totient is φ = 125387460.

The previous prime is 125607983. The next prime is 125608013. The reversal of 125608009 is 900806521.

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 a de Polignac number, because none of the positive numbers 2^k-125608009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125608079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109419 + ... + 110560.

It is an arithmetic number, because the mean of its divisors is an integer number (31457140).

Almost surely, 2^125608009 is an apocalyptic number.

It is an amenable number.

125608009 is a deficient number, since it is larger than the sum of its proper divisors (220551).

125608009 is an equidigital number, since it uses as much as digits as its factorization.

125608009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220550.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 125608009 is about 11207.4978920364. The cubic root of 125608009 is about 500.8093678072.

The spelling of 125608009 in words is "one hundred twenty-five million, six hundred eight thousand, nine".