689764499 has 2 divisors, whose sum is σ = 689764500. Its totient is φ = 689764498.

The previous prime is 689764489. The next prime is 689764501. The reversal of 689764499 is 994467986.

689764499 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 is a cyclic number.

It is not a de Polignac number, because 689764499 - 2⁴ = 689764483 is a prime.

It is a Sophie Germain prime.

Together with 689764501, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689764469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344882249 + 344882250.

It is an arithmetic number, because the mean of its divisors is an integer number (344882250).

Almost surely, 2^689764499 is an apocalyptic number.

689764499 is a deficient number, since it is larger than the sum of its proper divisors (1).

689764499 is an equidigital number, since it uses as much as digits as its factorization.

689764499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 62.

The square root of 689764499 is about 26263.3680056462. The cubic root of 689764499 is about 883.5550485420. Note that the first 3 decimals are identical.

The spelling of 689764499 in words is "six hundred eighty-nine million, seven hundred sixty-four thousand, four hundred ninety-nine".