650138009 has 2 divisors, whose sum is σ = 650138010. Its totient is φ = 650138008.

The previous prime is 650138003. The next prime is 650138011. The reversal of 650138009 is 900831056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529138009 + 121000000 = 23003^2 + 11000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650138009 is a prime.

Together with 650138011, 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 (650138003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325069004 + 325069005.

It is an arithmetic number, because the mean of its divisors is an integer number (325069005).

Almost surely, 2^650138009 is an apocalyptic number.

It is an amenable number.

650138009 is a deficient number, since it is larger than the sum of its proper divisors (1).

650138009 is an equidigital number, since it uses as much as digits as its factorization.

650138009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 650138009 is about 25497.8040034823. The cubic root of 650138009 is about 866.3004080757.

The spelling of 650138009 in words is "six hundred fifty million, one hundred thirty-eight thousand, nine".