998781971092 has 48 divisors (see below), whose sum is σ = 1816661468160. Its totient is φ = 480177923552.

The previous prime is 998781971053. The next prime is 998781971147. The reversal of 998781971092 is 290179187899.

It is a happy number.

It is a super-3 number, since 3×998781971092³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2614323 + ... + 2971909.

It is an arithmetic number, because the mean of its divisors is an integer number (37847113920).

Almost surely, 2^998781971092 is an apocalyptic number.

It is an amenable number.

998781971092 is a deficient number, since it is larger than the sum of its proper divisors (817879497068).

998781971092 is a wasteful number, since it uses less digits than its factorization.

998781971092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357900 (or 357898 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 70.

The spelling of 998781971092 in words is "nine hundred ninety-eight billion, seven hundred eighty-one million, nine hundred seventy-one thousand, ninety-two".