9905161 has 4 divisors (see below), whose sum is σ = 11320192. Its totient is φ = 8490132.

The previous prime is 9905141. The next prime is 9905167. The reversal of 9905161 is 1615099.

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: 1615099 = 131 ⋅12329.

It is not a de Polignac number, because 9905161 - 2⁹ = 9904649 is a prime.

It is a super-2 number, since 2×9905161² = 196224428871842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9905167) 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, 707505 + ... + 707518.

It is an arithmetic number, because the mean of its divisors is an integer number (2830048).

Almost surely, 2^9905161 is an apocalyptic number.

It is an amenable number.

9905161 is a deficient number, since it is larger than the sum of its proper divisors (1415031).

9905161 is a wasteful number, since it uses less digits than its factorization.

9905161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415030.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 9905161 is about 3147.2465743885. The cubic root of 9905161 is about 214.7602230453.

The spelling of 9905161 in words is "nine million, nine hundred five thousand, one hundred sixty-one".