99281 has 8 divisors (see below), whose sum is σ = 122304. Its totient is φ = 78480.

The previous prime is 99277. The next prime is 99289. The reversal of 99281 is 18299.

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 99281 - 2² = 99277 is a prime.

It is a super-2 number, since 2×99281² = 19713433922, which contains 22 as substring.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99281.

It is not an unprimeable number, because it can be changed into a prime (99289) 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, 455 + ... + 636.

It is an arithmetic number, because the mean of its divisors is an integer number (15288).

2⁹⁹²⁸¹ is an apocalyptic number.

99281 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

99281 is a deficient number, since it is larger than the sum of its proper divisors (23023).

99281 is a wasteful number, since it uses less digits than its factorization.

99281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111.

The product of its digits is 1296, while the sum is 29.

The square root of 99281 is about 315.0888763508. The cubic root of 99281 is about 46.3043772403.

The spelling of 99281 in words is "ninety-nine thousand, two hundred eighty-one".