125471809 has 8 divisors (see below), whose sum is σ = 127139840. Its totient is φ = 123814656.

The previous prime is 125471803. The next prime is 125471833. The reversal of 125471809 is 908174521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125471809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125471803) 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 7 ways as a sum of consecutive naturals, for example, 21952 + ... + 27070.

It is an arithmetic number, because the mean of its divisors is an integer number (15892480).

Almost surely, 2^125471809 is an apocalyptic number.

It is an amenable number.

125471809 is a deficient number, since it is larger than the sum of its proper divisors (1668031).

125471809 is a wasteful number, since it uses less digits than its factorization.

125471809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 125471809 is about 11201.4199546308. The cubic root of 125471809 is about 500.6282888422.

The spelling of 125471809 in words is "one hundred twenty-five million, four hundred seventy-one thousand, eight hundred nine".