509391147 has 4 divisors (see below), whose sum is σ = 679188200. Its totient is φ = 339594096.

The previous prime is 509391139. The next prime is 509391187. The reversal of 509391147 is 741193905.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 509391147 - 2³ = 509391139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509391107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84898522 + ... + 84898527.

It is an arithmetic number, because the mean of its divisors is an integer number (169797050).

Almost surely, 2^509391147 is an apocalyptic number.

509391147 is a deficient number, since it is larger than the sum of its proper divisors (169797053).

509391147 is a wasteful number, since it uses less digits than its factorization.

509391147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169797052.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 509391147 is about 22569.6953235971. The cubic root of 509391147 is about 798.6389079948.

The spelling of 509391147 in words is "five hundred nine million, three hundred ninety-one thousand, one hundred forty-seven".