651309689 has 2 divisors, whose sum is σ = 651309690. Its totient is φ = 651309688.

The previous prime is 651309649. The next prime is 651309697. The reversal of 651309689 is 986903156.

651309689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391842025 + 259467664 = 19795^2 + 16108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651309689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (651309629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325654844 + 325654845.

It is an arithmetic number, because the mean of its divisors is an integer number (325654845).

Almost surely, 2^651309689 is an apocalyptic number.

It is an amenable number.

651309689 is a deficient number, since it is larger than the sum of its proper divisors (1).

651309689 is an equidigital number, since it uses as much as digits as its factorization.

651309689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 651309689 is about 25520.7697571997. The cubic root of 651309689 is about 866.8205118571.

The spelling of 651309689 in words is "six hundred fifty-one million, three hundred nine thousand, six hundred eighty-nine".