998827121 has 4 divisors (see below), whose sum is σ = 998899200. Its totient is φ = 998755044.

The previous prime is 998827087. The next prime is 998827213. The reversal of 998827121 is 121728899.

998827121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 998827121 - 2⁶ = 998827057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998821121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7961 + ... + 45398.

It is an arithmetic number, because the mean of its divisors is an integer number (249724800).

Almost surely, 2^998827121 is an apocalyptic number.

It is an amenable number.

998827121 is a deficient number, since it is larger than the sum of its proper divisors (72079).

998827121 is a wasteful number, since it uses less digits than its factorization.

998827121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72078.

The product of its digits is 145152, while the sum is 47.

The square root of 998827121 is about 31604.2263154788. The cubic root of 998827121 is about 999.6088873842.

The spelling of 998827121 in words is "nine hundred ninety-eight million, eight hundred twenty-seven thousand, one hundred twenty-one".