698423909 has 2 divisors, whose sum is σ = 698423910. Its totient is φ = 698423908.

The previous prime is 698423899. The next prime is 698423933. The reversal of 698423909 is 909324896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432016225 + 266407684 = 20785^2 + 16322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698423909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (698423939) 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, 349211954 + 349211955.

It is an arithmetic number, because the mean of its divisors is an integer number (349211955).

Almost surely, 2^698423909 is an apocalyptic number.

It is an amenable number.

698423909 is a deficient number, since it is larger than the sum of its proper divisors (1).

698423909 is an equidigital number, since it uses as much as digits as its factorization.

698423909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The square root of 698423909 is about 26427.7110056849. The cubic root of 698423909 is about 887.2371116893.

The spelling of 698423909 in words is "six hundred ninety-eight million, four hundred twenty-three thousand, nine hundred nine".