998391334480597 has 4 divisors (see below), whose sum is σ = 998391398978380. Its totient is φ = 998391269982816.

The previous prime is 998391334480499. The next prime is 998391334480619. The reversal of 998391334480597 is 795084433193899.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 320594790435921 + 677796544044676 = 17905161^2 + 26034526^2 .

It is a 3-Lehmer number, since φ(998391334480597) divides (998391334480597-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998391334480597 is a prime.

It is a super-2 number, since 2×998391334480597² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 998391334480597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998391334484597) 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, 6449779 + ... + 45148447.

It is an arithmetic number, because the mean of its divisors is an integer number (249597849744595).

It is a Poulet number, since it divides 2^{998391334480596}-1.

Almost surely, 2^{998391334480597} is an apocalyptic number.

998391334480597 is the 25799113-rd pentagonal number.

It is an amenable number.

998391334480597 is a deficient number, since it is larger than the sum of its proper divisors (64497783).

998391334480597 is a wasteful number, since it uses less digits than its factorization.

998391334480597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64497782.

The product of its (nonzero) digits is 6348948480, while the sum is 82.

The spelling of 998391334480597 in words is "nine hundred ninety-eight trillion, three hundred ninety-one billion, three hundred thirty-four million, four hundred eighty thousand, five hundred ninety-seven".