998821513 has 8 divisors (see below), whose sum is σ = 1014366248.
Its totient is φ = 983384064.
The previous prime is 998821511. The next prime is 998821559. The reversal of 998821513 is 315128899.
998821513 = 223472 + 223482.
998821513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 4 ways, for example, as 199741689 + 799079824 = 14133^2 + 28268^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 998821513 - 21 = 998821511 is a prime.
It is not an unprimeable number, because it can be changed into a prime (998821511) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7956 + ... + 45397.
It is an arithmetic number, because the mean of its divisors is an integer number (126795781).
Almost surely, 2998821513 is an apocalyptic number.
998821513 is the 22348-th centered square number.
It is an amenable number.
998821513 is a deficient number, since it is larger than the sum of its proper divisors (15544735).
998821513 is a wasteful number, since it uses less digits than its factorization.
998821513 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 53643.
The product of its digits is 155520, while the sum is 46.
The square root of 998821513 is about 31604.1375930431.
The cubic root of 998821513 is about 999.6070165843.
The spelling of 998821513 in words is "nine hundred ninety-eight million, eight hundred twenty-one thousand, five hundred thirteen".