1001111000998 has 32 divisors (see below), whose sum is σ = 1589771335680. Its totient is φ = 472064906880.

The previous prime is 1001111000927. The next prime is 1001111000999. The reversal of 1001111000998 is 8990001111001.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001111000999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 742686 + ... + 1598062.

It is an arithmetic number, because the mean of its divisors is an integer number (49680354240).

Almost surely, 2^{1001111000998} is an apocalyptic number.

1001111000998 is a deficient number, since it is larger than the sum of its proper divisors (588660334682).

1001111000998 is a wasteful number, since it uses less digits than its factorization.

1001111000998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855892.

The product of its (nonzero) digits is 648, while the sum is 31.

Adding to 1001111000998 its reverse (8990001111001), we get a palindrome (9991112111999).

The spelling of 1001111000998 in words is "one trillion, one billion, one hundred eleven million, nine hundred ninety-eight", and thus it is an aban number.