689471399 has 2 divisors, whose sum is σ = 689471400. Its totient is φ = 689471398.

The previous prime is 689471383. The next prime is 689471401. The reversal of 689471399 is 993174986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689471399 - 2⁴ = 689471383 is a prime.

Together with 689471401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689471359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344735699 + 344735700.

It is an arithmetic number, because the mean of its divisors is an integer number (344735700).

Almost surely, 2^689471399 is an apocalyptic number.

689471399 is a deficient number, since it is larger than the sum of its proper divisors (1).

689471399 is an equidigital number, since it uses as much as digits as its factorization.

689471399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The square root of 689471399 is about 26257.7873972656. The cubic root of 689471399 is about 883.4298818245.

The spelling of 689471399 in words is "six hundred eighty-nine million, four hundred seventy-one thousand, three hundred ninety-nine".