500051009 has 2 divisors, whose sum is σ = 500051010. Its totient is φ = 500051008.

The previous prime is 500050979. The next prime is 500051011. The reversal of 500051009 is 900150005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473497600 + 26553409 = 21760^2 + 5153^2 .

It is a cyclic number.

It is not a de Polignac number, because 500051009 - 2²⁰ = 499002433 is a prime.

Together with 500051011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (500051029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250025504 + 250025505.

It is an arithmetic number, because the mean of its divisors is an integer number (250025505).

Almost surely, 2^500051009 is an apocalyptic number.

It is an amenable number.

500051009 is a deficient number, since it is larger than the sum of its proper divisors (1).

500051009 is an equidigital number, since it uses as much as digits as its factorization.

500051009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 500051009 is about 22361.8203418237. The cubic root of 500051009 is about 793.7275156464.

The spelling of 500051009 in words is "five hundred million, fifty-one thousand, nine".