509906069 has 2 divisors, whose sum is σ = 509906070. Its totient is φ = 509906068.

The previous prime is 509906027. The next prime is 509906087. The reversal of 509906069 is 960609905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271821169 + 238084900 = 16487^2 + 15430^2 .

It is a cyclic number.

It is not a de Polignac number, because 509906069 - 2⁸ = 509905813 is a prime.

It is a super-2 number, since 2×509906069² = 520008398406065522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509906669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254953034 + 254953035.

It is an arithmetic number, because the mean of its divisors is an integer number (254953035).

Almost surely, 2^509906069 is an apocalyptic number.

It is an amenable number.

509906069 is a deficient number, since it is larger than the sum of its proper divisors (1).

509906069 is an equidigital number, since it uses as much as digits as its factorization.

509906069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 509906069 is about 22581.0998182108. The cubic root of 509906069 is about 798.9079208197.

The spelling of 509906069 in words is "five hundred nine million, nine hundred six thousand, sixty-nine".