698989899 has 4 divisors (see below), whose sum is σ = 931986536. Its totient is φ = 465993264.

The previous prime is 698989861. The next prime is 698989909. The reversal of 698989899 is 998989896.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 698989899 - 2¹¹ = 698987851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 698989899.

It is not an unprimeable number, because it can be changed into a prime (698989399) 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, 116498314 + ... + 116498319.

It is an arithmetic number, because the mean of its divisors is an integer number (232996634).

Almost surely, 2^698989899 is an apocalyptic number.

698989899 is a deficient number, since it is larger than the sum of its proper divisors (232996637).

698989899 is a wasteful number, since it uses less digits than its factorization.

698989899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232996636.

The product of its digits is 181398528, while the sum is 75.

The square root of 698989899 is about 26438.4171046604. The cubic root of 698989899 is about 887.4767139033.

Multiplying 698989899 by its sum of digits (75), we get a palindrome (52424242425).

It can be divided in two parts, 69898 and 9899, that added together give a palindrome (79797).

The spelling of 698989899 in words is "six hundred ninety-eight million, nine hundred eighty-nine thousand, eight hundred ninety-nine".