998204609 has 4 divisors (see below), whose sum is σ = 999888516. Its totient is φ = 996520704.

The previous prime is 998204567. The next prime is 998204629. The reversal of 998204609 is 906402899.

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

It can be written as a sum of positive squares in 2 ways, for example, as 584285584 + 413919025 = 24172^2 + 20345^2 .

It is a cyclic number.

It is not a de Polignac number, because 998204609 - 2⁸ = 998204353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998204629) 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, 841064 + ... + 842249.

It is an arithmetic number, because the mean of its divisors is an integer number (249972129).

Almost surely, 2^998204609 is an apocalyptic number.

It is an amenable number.

998204609 is a deficient number, since it is larger than the sum of its proper divisors (1683907).

998204609 is a wasteful number, since it uses less digits than its factorization.

998204609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683906.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 998204609 is about 31594.3762242586. The cubic root of 998204609 is about 999.4011778169.

The spelling of 998204609 in words is "nine hundred ninety-eight million, two hundred four thousand, six hundred nine".