509123 has 2 divisors, whose sum is σ = 509124. Its totient is φ = 509122.

The previous prime is 509101. The next prime is 509137. The reversal of 509123 is 321905.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 509123 - 2⁸ = 508867 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 509095 and 509104.

It is not a weakly prime, because it can be changed into another prime (509023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254561 + 254562.

It is an arithmetic number, because the mean of its divisors is an integer number (254562).

2⁵⁰⁹¹²³ is an apocalyptic number.

509123 is a deficient number, since it is larger than the sum of its proper divisors (1).

509123 is an equidigital number, since it uses as much as digits as its factorization.

509123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 509123 is about 713.5285558406. The cubic root of 509123 is about 79.8498747062.

The spelling of 509123 in words is "five hundred nine thousand, one hundred twenty-three".