688249843 has 2 divisors, whose sum is σ = 688249844. Its totient is φ = 688249842.

The previous prime is 688249841. The next prime is 688249853. The reversal of 688249843 is 348942886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688249843 - 2¹ = 688249841 is a prime.

Together with 688249841, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (688249841) 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, 344124921 + 344124922.

It is an arithmetic number, because the mean of its divisors is an integer number (344124922).

Almost surely, 2^688249843 is an apocalyptic number.

688249843 is a deficient number, since it is larger than the sum of its proper divisors (1).

688249843 is an equidigital number, since it uses as much as digits as its factorization.

688249843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 52.

The square root of 688249843 is about 26234.5162524488. The cubic root of 688249843 is about 882.9078408194.

The spelling of 688249843 in words is "six hundred eighty-eight million, two hundred forty-nine thousand, eight hundred forty-three".