99081 has 12 divisors (see below), whose sum is σ = 145860. Its totient is φ = 64800.

The previous prime is 99079. The next prime is 99083. The reversal of 99081 is 18099.

99081 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (99079) and next prime (99083).

It can be written as a sum of positive squares in 2 ways, for example, as 84681 + 14400 = 291^2 + 120^2 .

It is not a de Polignac number, because 99081 - 2¹ = 99079 is a prime.

It is a super-2 number, since 2×99081² = 19634089122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99083) 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, 855 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (12155).

2⁹⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

99081 is a deficient number, since it is larger than the sum of its proper divisors (46779).

99081 is a wasteful number, since it uses less digits than its factorization.

99081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 99081 is about 314.7713455828. The cubic root of 99081 is about 46.2732631934.

The spelling of 99081 in words is "ninety-nine thousand, eighty-one".