9905281 has 4 divisors (see below), whose sum is σ = 10044864. Its totient is φ = 9765700.

The previous prime is 9905267. The next prime is 9905293. The reversal of 9905281 is 1825099.

9905281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 9905281 - 2¹⁷ = 9774209 is a prime.

It is a super-2 number, since 2×9905281² = 196229183377922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9905221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69685 + ... + 69826.

It is an arithmetic number, because the mean of its divisors is an integer number (2511216).

Almost surely, 2^9905281 is an apocalyptic number.

9905281 is the 1408-th centered decagonal number.

It is an amenable number.

9905281 is a deficient number, since it is larger than the sum of its proper divisors (139583).

9905281 is a wasteful number, since it uses less digits than its factorization.

9905281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139582.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 9905281 is about 3147.2656386139. The cubic root of 9905281 is about 214.7610903078.

The spelling of 9905281 in words is "nine million, nine hundred five thousand, two hundred eighty-one".