998204981 has 12 divisors (see below), whose sum is σ = 1036626948. Its totient is φ = 961085952.

The previous prime is 998204959. The next prime is 998205007. The reversal of 998204981 is 189402899.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 409414756 + 588790225 = 20234^2 + 24265^2 .

It is not a de Polignac number, because 998204981 - 2¹⁰ = 998203957 is a prime.

It is a super-2 number, since 2×998204981² = 1992826368186420722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998204951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129035 + ... + 136551.

It is an arithmetic number, because the mean of its divisors is an integer number (86385579).

Almost surely, 2^998204981 is an apocalyptic number.

It is an amenable number.

998204981 is a deficient number, since it is larger than the sum of its proper divisors (38421967).

998204981 is an equidigital number, since it uses as much as digits as its factorization.

998204981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688 (or 7651 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 998204981 is about 31594.3821113818. The cubic root of 998204981 is about 999.4013019655.

The spelling of 998204981 in words is "nine hundred ninety-eight million, two hundred four thousand, nine hundred eighty-one".