99811845 has 160 divisors (see below), whose sum is σ = 229996800. Its totient is φ = 40310784.

The previous prime is 99811819. The next prime is 99811849. The reversal of 99811845 is 54811899.

It is not a de Polignac number, because 99811845 - 2⁵ = 99811813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (103680) is a multiple of the sum of its prime divisors (160).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99811845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99811849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 915651 + ... + 915759.

It is an arithmetic number, because the mean of its divisors is an integer number (1437480).

Almost surely, 2^99811845 is an apocalyptic number.

99811845 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99811845 is an abundant number, since it is smaller than the sum of its proper divisors (130184955).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99811845 is a wasteful number, since it uses less digits than its factorization.

99811845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 160 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 99811845 is about 9990.5878205439. The cubic root of 99811845 is about 463.8675878735.

The spelling of 99811845 in words is "ninety-nine million, eight hundred eleven thousand, eight hundred forty-five".