998817659 has 8 divisors (see below), whose sum is σ = 1141944288. Its totient is φ = 855800640.

The previous prime is 998817649. The next prime is 998817661. The reversal of 998817659 is 956718899.

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 998817659 - 2¹⁶ = 998752123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998817649) 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, 6842 + ... + 45215.

It is an arithmetic number, because the mean of its divisors is an integer number (142743036).

Almost surely, 2^998817659 is an apocalyptic number.

998817659 is a deficient number, since it is larger than the sum of its proper divisors (143126629).

998817659 is a wasteful number, since it uses less digits than its factorization.

998817659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54805.

The product of its digits is 9797760, while the sum is 62.

The square root of 998817659 is about 31604.0766199552. The cubic root of 998817659 is about 999.6057309056.

The spelling of 998817659 in words is "nine hundred ninety-eight million, eight hundred seventeen thousand, six hundred fifty-nine".