509201291 has 4 divisors (see below), whose sum is σ = 509607000. Its totient is φ = 508795584.

The previous prime is 509201219. The next prime is 509201317. The reversal of 509201291 is 192102905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192102905 = 5 ⋅38420581.

It is a cyclic number.

It is not a de Polignac number, because 509201291 - 2²² = 505006987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509201191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200966 + ... + 203483.

It is an arithmetic number, because the mean of its divisors is an integer number (127401750).

Almost surely, 2^509201291 is an apocalyptic number.

509201291 is a deficient number, since it is larger than the sum of its proper divisors (405709).

509201291 is a wasteful number, since it uses less digits than its factorization.

509201291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405708.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 509201291 is about 22565.4889377563. The cubic root of 509201291 is about 798.5396749981.

The spelling of 509201291 in words is "five hundred nine million, two hundred one thousand, two hundred ninety-one".