99685881 has 12 divisors (see below), whose sum is σ = 147882852. Its totient is φ = 64660896.

The previous prime is 99685877. The next prime is 99685897. The reversal of 99685881 is 18858699.

It can be written as a sum of positive squares in 2 ways, for example, as 88736400 + 10949481 = 9420^2 + 3309^2 .

It is not a de Polignac number, because 99685881 - 2² = 99685877 is a prime.

It is a super-2 number, since 2×99685881² = 19874549741492322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99685811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149346 + ... + 150011.

It is an arithmetic number, because the mean of its divisors is an integer number (12323571).

Almost surely, 2^99685881 is an apocalyptic number.

It is an amenable number.

99685881 is a deficient number, since it is larger than the sum of its proper divisors (48196971).

99685881 is a wasteful number, since it uses less digits than its factorization.

99685881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299400 (or 299397 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 99685881 is about 9984.2816967471. The cubic root of 99685881 is about 463.6723698471.

The spelling of 99685881 in words is "ninety-nine million, six hundred eighty-five thousand, eight hundred eighty-one".