509139625 has 16 divisors (see below), whose sum is σ = 639999360. Its totient is φ = 404367600.

The previous prime is 509139623. The next prime is 509139641. The reversal of 509139625 is 526931905.

It is a happy number.

It is not a de Polignac number, because 509139625 - 2¹ = 509139623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (509139623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2724 + ... + 32026.

It is an arithmetic number, because the mean of its divisors is an integer number (39999960).

Almost surely, 2^509139625 is an apocalyptic number.

It is an amenable number.

509139625 is a deficient number, since it is larger than the sum of its proper divisors (130859735).

509139625 is a wasteful number, since it uses less digits than its factorization.

509139625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29457 (or 29447 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 509139625 is about 22564.1225178379. The cubic root of 509139625 is about 798.5074384108.

The spelling of 509139625 in words is "five hundred nine million, one hundred thirty-nine thousand, six hundred twenty-five".