509378531 has 8 divisors (see below), whose sum is σ = 542139984. Its totient is φ = 476928000.

The previous prime is 509378521. The next prime is 509378537. The reversal of 509378531 is 135873905.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 509378531 - 2²² = 505184227 is a prime.

It is a super-2 number, since 2×509378531² = 518932975687435922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509378537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74345 + ... + 80906.

It is an arithmetic number, because the mean of its divisors is an integer number (67767498).

Almost surely, 2^509378531 is an apocalyptic number.

509378531 is a deficient number, since it is larger than the sum of its proper divisors (32761453).

509378531 is a wasteful number, since it uses less digits than its factorization.

509378531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155461.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 509378531 is about 22569.4158320502. The cubic root of 509378531 is about 798.6323146911.

The spelling of 509378531 in words is "five hundred nine million, three hundred seventy-eight thousand, five hundred thirty-one".