998817567 has 16 divisors (see below), whose sum is σ = 1458915840. Its totient is φ = 602806400.

The previous prime is 998817559. The next prime is 998817569. The reversal of 998817567 is 765718899.

It is a cyclic number.

It is not a de Polignac number, because 998817567 - 2³ = 998817559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998817567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998817569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55434 + ... + 71207.

It is an arithmetic number, because the mean of its divisors is an integer number (91182240).

Almost surely, 2^998817567 is an apocalyptic number.

998817567 is a deficient number, since it is larger than the sum of its proper divisors (460098273).

998817567 is a wasteful number, since it uses less digits than its factorization.

998817567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126894.

The product of its digits is 7620480, while the sum is 60.

The square root of 998817567 is about 31604.0751644468. The cubic root of 998817567 is about 999.6057002148.

The spelling of 998817567 in words is "nine hundred ninety-eight million, eight hundred seventeen thousand, five hundred sixty-seven".