698050109 has 4 divisors (see below), whose sum is σ = 698106300. Its totient is φ = 697993920.

The previous prime is 698050079. The next prime is 698050117. The reversal of 698050109 is 901050896.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 531072025 + 166978084 = 23045^2 + 12922^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698050109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698050189) 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 in 3 ways as a sum of consecutive naturals, for example, 284 + ... + 37365.

It is an arithmetic number, because the mean of its divisors is an integer number (174526575).

Almost surely, 2^698050109 is an apocalyptic number.

It is an amenable number.

698050109 is a deficient number, since it is larger than the sum of its proper divisors (56191).

698050109 is a wasteful number, since it uses less digits than its factorization.

698050109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56190.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 698050109 is about 26420.6379370370. The cubic root of 698050109 is about 887.0787988498.

The spelling of 698050109 in words is "six hundred ninety-eight million, fifty thousand, one hundred nine".