99999281 has 4 divisors (see below), whose sum is σ = 100044864. Its totient is φ = 99953700.

The previous prime is 99999259. The next prime is 99999307. The reversal of 99999281 is 18299999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99999281 - 2⁶ = 99999217 is a prime.

It is a super-2 number, since 2×99999281² = 19999712401033922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99999481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19325 + ... + 23946.

It is an arithmetic number, because the mean of its divisors is an integer number (25011216).

Almost surely, 2^99999281 is an apocalyptic number.

It is an amenable number.

99999281 is a deficient number, since it is larger than the sum of its proper divisors (45583).

99999281 is a wasteful number, since it uses less digits than its factorization.

99999281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45582.

The product of its digits is 944784, while the sum is 56.

The square root of 99999281 is about 9999.9640499354. The cubic root of 99999281 is about 464.1577709245.

The spelling of 99999281 in words is "ninety-nine million, nine hundred ninety-nine thousand, two hundred eighty-one".