99881145 has 48 divisors (see below), whose sum is σ = 213088512. Its totient is φ = 42145920.

The previous prime is 99881123. The next prime is 99881149. The reversal of 99881145 is 54118899.

It is not a de Polignac number, because 99881145 - 2⁸ = 99880889 is a prime.

It is a super-2 number, since 2×99881145² = 19952486253022050, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 99881145.

It is not an unprimeable number, because it can be changed into a prime (99881149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8101 + ... + 16290.

It is an arithmetic number, because the mean of its divisors is an integer number (4439344).

Almost surely, 2^99881145 is an apocalyptic number.

It is an amenable number.

99881145 is an abundant number, since it is smaller than the sum of its proper divisors (113207367).

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

99881145 is a wasteful number, since it uses less digits than its factorization.

99881145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24422 (or 24419 counting only the distinct ones).

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

The square root of 99881145 is about 9994.0554831360. The cubic root of 99881145 is about 463.9749184446.

The spelling of 99881145 in words is "ninety-nine million, eight hundred eighty-one thousand, one hundred forty-five".