998911 has 4 divisors (see below), whose sum is σ = 1000912. Its totient is φ = 996912.

The previous prime is 998909. The next prime is 998917. The reversal of 998911 is 119899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998911 - 2¹ = 998909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998917) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 451 + ... + 1483.

It is an arithmetic number, because the mean of its divisors is an integer number (250228).

2⁹⁹⁸⁹¹¹ is an apocalyptic number.

998911 is a deficient number, since it is larger than the sum of its proper divisors (2001).

998911 is a wasteful number, since it uses less digits than its factorization.

998911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000.

The product of its digits is 5832, while the sum is 37.

The square root of 998911 is about 999.4553516791. The cubic root of 998911 is about 99.9636868151.

It can be divided in two parts, 9989 and 11, that added together give a 4-th power (10000 = 10⁴).

The spelling of 998911 in words is "nine hundred ninety-eight thousand, nine hundred eleven".