509647123 has 2 divisors, whose sum is σ = 509647124. Its totient is φ = 509647122.

The previous prime is 509647067. The next prime is 509647157. The reversal of 509647123 is 321746905.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 509647123 - 2¹³ = 509638931 is a prime.

It is not a weakly prime, because it can be changed into another prime (509347123) 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, 254823561 + 254823562.

It is an arithmetic number, because the mean of its divisors is an integer number (254823562).

Almost surely, 2^509647123 is an apocalyptic number.

509647123 is a deficient number, since it is larger than the sum of its proper divisors (1).

509647123 is an equidigital number, since it uses as much as digits as its factorization.

509647123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 509647123 is about 22575.3654012510. The cubic root of 509647123 is about 798.7726612416.

The spelling of 509647123 in words is "five hundred nine million, six hundred forty-seven thousand, one hundred twenty-three".