650771609 has 2 divisors, whose sum is σ = 650771610. Its totient is φ = 650771608.

The previous prime is 650771599. The next prime is 650771617. The reversal of 650771609 is 906177056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 465049225 + 185722384 = 21565^2 + 13628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650771609 is a prime.

It is not a weakly prime, because it can be changed into another prime (650771689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325385804 + 325385805.

It is an arithmetic number, because the mean of its divisors is an integer number (325385805).

Almost surely, 2^650771609 is an apocalyptic number.

It is an amenable number.

650771609 is a deficient number, since it is larger than the sum of its proper divisors (1).

650771609 is an equidigital number, since it uses as much as digits as its factorization.

650771609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 650771609 is about 25510.2255772073. The cubic root of 650771609 is about 866.5817379466.

The spelling of 650771609 in words is "six hundred fifty million, seven hundred seventy-one thousand, six hundred nine".