999998811 has 48 divisors (see below), whose sum is σ = 1738864800. Its totient is φ = 566286336.

The previous prime is 999998801. The next prime is 999998843. The reversal of 999998811 is 118899999.

It is not a de Polignac number, because 999998811 - 2⁷ = 999998683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999998801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146155 + ... + 152843.

It is an arithmetic number, because the mean of its divisors is an integer number (36226350).

Almost surely, 2^999998811 is an apocalyptic number.

999998811 is a deficient number, since it is larger than the sum of its proper divisors (738865989).

999998811 is a wasteful number, since it uses less digits than its factorization.

999998811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6825 (or 6812 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 63.

The square root of 999998811 is about 31622.7578019375. The cubic root of 999998811 is about 999.9996036665. Note that the first 3 decimals are identical.

It can be divided in two parts, 9999988 and 11, that added together give a palindrome (9999999).

The spelling of 999998811 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred eleven".