509641667 has 2 divisors, whose sum is σ = 509641668. Its totient is φ = 509641666.

The previous prime is 509641661. The next prime is 509641681. The reversal of 509641667 is 766146905.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 509641667 - 2⁴ = 509641651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (509641661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254820833 + 254820834.

It is an arithmetic number, because the mean of its divisors is an integer number (254820834).

Almost surely, 2^509641667 is an apocalyptic number.

509641667 is a deficient number, since it is larger than the sum of its proper divisors (1).

509641667 is an equidigital number, since it uses as much as digits as its factorization.

509641667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 509641667 is about 22575.2445612445. The cubic root of 509641667 is about 798.7698108254.

The spelling of 509641667 in words is "five hundred nine million, six hundred forty-one thousand, six hundred sixty-seven".