125143209 has 12 divisors (see below), whose sum is σ = 180965616. Its totient is φ = 83335032.

The previous prime is 125143199. The next prime is 125143211. The reversal of 125143209 is 902341521.

It is not a de Polignac number, because 125143209 - 2⁹ = 125142697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125143259) 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, 1182 + ... + 15864.

It is an arithmetic number, because the mean of its divisors is an integer number (15080468).

Almost surely, 2^125143209 is an apocalyptic number.

It is an amenable number.

125143209 is a deficient number, since it is larger than the sum of its proper divisors (55822407).

125143209 is a wasteful number, since it uses less digits than its factorization.

125143209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15636 (or 15633 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 125143209 is about 11186.7425553644. The cubic root of 125143209 is about 500.1908724595.

The spelling of 125143209 in words is "one hundred twenty-five million, one hundred forty-three thousand, two hundred nine".