689299657 has 2 divisors, whose sum is σ = 689299658. Its totient is φ = 689299656.

The previous prime is 689299621. The next prime is 689299691. The reversal of 689299657 is 756992986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405579321 + 283720336 = 20139^2 + 16844^2 .

It is a cyclic number.

It is not a de Polignac number, because 689299657 - 2¹⁵ = 689266889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689299595 and 689299604.

It is not a weakly prime, because it can be changed into another prime (689299607) 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, 344649828 + 344649829.

It is an arithmetic number, because the mean of its divisors is an integer number (344649829).

Almost surely, 2^689299657 is an apocalyptic number.

It is an amenable number.

689299657 is a deficient number, since it is larger than the sum of its proper divisors (1).

689299657 is an equidigital number, since it uses as much as digits as its factorization.

689299657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 61.

The square root of 689299657 is about 26254.5168875757. The cubic root of 689299657 is about 883.3565238799.

The spelling of 689299657 in words is "six hundred eighty-nine million, two hundred ninety-nine thousand, six hundred fifty-seven".