689810497 has 2 divisors, whose sum is σ = 689810498. Its totient is φ = 689810496.

The previous prime is 689810491. The next prime is 689810521. The reversal of 689810497 is 794018986.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688747536 + 1062961 = 26244^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 689810497 - 2²³ = 681421889 is a prime.

It is not a weakly prime, because it can be changed into another prime (689810491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344905248 + 344905249.

It is an arithmetic number, because the mean of its divisors is an integer number (344905249).

Almost surely, 2^689810497 is an apocalyptic number.

It is an amenable number.

689810497 is a deficient number, since it is larger than the sum of its proper divisors (1).

689810497 is an equidigital number, since it uses as much as digits as its factorization.

689810497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 689810497 is about 26264.2436974682. The cubic root of 689810497 is about 883.5746885118.

The spelling of 689810497 in words is "six hundred eighty-nine million, eight hundred ten thousand, four hundred ninety-seven".