509278125 has 24 divisors (see below), whose sum is σ = 848758176. Its totient is φ = 271610000.

The previous prime is 509278117. The next prime is 509278127. The reversal of 509278125 is 521872905.

It is not a de Polignac number, because 509278125 - 2³ = 509278117 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509278127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17787 + ... + 36536.

It is an arithmetic number, because the mean of its divisors is an integer number (35364924).

Almost surely, 2^509278125 is an apocalyptic number.

It is an amenable number.

509278125 is a deficient number, since it is larger than the sum of its proper divisors (339480051).

509278125 is an frugal number, since it uses more digits than its factorization.

509278125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54351 (or 54331 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 509278125 is about 22567.1913405280. The cubic root of 509278125 is about 798.5798371846.

The spelling of 509278125 in words is "five hundred nine million, two hundred seventy-eight thousand, one hundred twenty-five".