689476442009 has 2 divisors, whose sum is σ = 689476442010. Its totient is φ = 689476442008.

The previous prime is 689476441939. The next prime is 689476442027. The reversal of 689476442009 is 900244674986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595448352409 + 94028089600 = 771653^2 + 306640^2 .

It is a cyclic number.

It is not a de Polignac number, because 689476442009 - 2³² = 685181474713 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 (689476462009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344738221004 + 344738221005.

It is an arithmetic number, because the mean of its divisors is an integer number (344738221005).

Almost surely, 2^689476442009 is an apocalyptic number.

It is an amenable number.

689476442009 is a deficient number, since it is larger than the sum of its proper divisors (1).

689476442009 is an equidigital number, since it uses as much as digits as its factorization.

689476442009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 689476442009 in words is "six hundred eighty-nine billion, four hundred seventy-six million, four hundred forty-two thousand, nine".