99999811 has 8 divisors (see below), whose sum is σ = 103561920. Its totient is φ = 96493992.

The previous prime is 99999787. The next prime is 99999821. The reversal of 99999811 is 11899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999811 - 2²¹ = 97902659 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10441 + ... + 17578.

It is an arithmetic number, because the mean of its divisors is an integer number (12945240).

Almost surely, 2^99999811 is an apocalyptic number.

99999811 is a deficient number, since it is larger than the sum of its proper divisors (3562109).

99999811 is a wasteful number, since it uses less digits than its factorization.

99999811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28145.

The product of its digits is 472392, while the sum is 55.

The square root of 99999811 is about 9999.9905499955. The cubic root of 99999811 is about 464.1585909410.

It can be divided in two parts, 9999 and 9811, that multiplied together give a palindrome (98100189).

The spelling of 99999811 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred eleven".