509978231 has 16 divisors (see below), whose sum is σ = 596448000. Its totient is φ = 435859704.

The previous prime is 509978173. The next prime is 509978251. The reversal of 509978231 is 132879905.

It is not a de Polignac number, because 509978231 - 2⁶ = 509978167 is a prime.

It is a super-2 number, since 2×509978231² = 520155592187778722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509978251) 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, 128036 + ... + 131958.

It is an arithmetic number, because the mean of its divisors is an integer number (37278000).

Almost surely, 2^509978231 is an apocalyptic number.

509978231 is a deficient number, since it is larger than the sum of its proper divisors (86469769).

509978231 is an equidigital number, since it uses as much as digits as its factorization.

509978231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323 (or 4309 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 509978231 is about 22582.6976023681. The cubic root of 509978231 is about 798.9456062403.

The spelling of 509978231 in words is "five hundred nine million, nine hundred seventy-eight thousand, two hundred thirty-one".