509023831 has 2 divisors, whose sum is σ = 509023832. Its totient is φ = 509023830.

The previous prime is 509023807. The next prime is 509023883. The reversal of 509023831 is 138320905.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509023831 - 2⁵ = 509023799 is a prime.

It is a super-2 number, since 2×509023831² = 518210521051833122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 509023793 and 509023802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509023331) 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 as a sum of consecutive naturals, namely, 254511915 + 254511916.

It is an arithmetic number, because the mean of its divisors is an integer number (254511916).

Almost surely, 2^509023831 is an apocalyptic number.

509023831 is a deficient number, since it is larger than the sum of its proper divisors (1).

509023831 is an equidigital number, since it uses as much as digits as its factorization.

509023831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 509023831 is about 22561.5564844272. The cubic root of 509023831 is about 798.4468987761.

The spelling of 509023831 in words is "five hundred nine million, twenty-three thousand, eight hundred thirty-one".