99859281 has 4 divisors (see below), whose sum is σ = 133145712. Its totient is φ = 66572852.

The previous prime is 99859273. The next prime is 99859289. The reversal of 99859281 is 18295899.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18295899 = 3 ⋅6098633.

It is an interprime number because it is at equal distance from previous prime (99859273) and next prime (99859289).

It is a cyclic number.

It is not a de Polignac number, because 99859281 - 2³ = 99859273 is a prime.

It is a super-2 number, since 2×99859281² = 19943752003673922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99859289) 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, 16643211 + ... + 16643216.

It is an arithmetic number, because the mean of its divisors is an integer number (33286428).

Almost surely, 2^99859281 is an apocalyptic number.

It is an amenable number.

99859281 is a deficient number, since it is larger than the sum of its proper divisors (33286431).

99859281 is a wasteful number, since it uses less digits than its factorization.

99859281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33286430.

The product of its digits is 466560, while the sum is 51.

The square root of 99859281 is about 9992.9615730273. The cubic root of 99859281 is about 463.9410612439.

The spelling of 99859281 in words is "ninety-nine million, eight hundred fifty-nine thousand, two hundred eighty-one".