9891617 has 4 divisors (see below), whose sum is σ = 10158996. Its totient is φ = 9624240.

The previous prime is 9891613. The next prime is 9891653. The reversal of 9891617 is 7161989.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7161989 = 181 ⋅39569.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 625681 = 3044^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891617 - 2² = 9891613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9891613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133634 + ... + 133707.

It is an arithmetic number, because the mean of its divisors is an integer number (2539749).

Almost surely, 2^9891617 is an apocalyptic number.

It is an amenable number.

9891617 is a deficient number, since it is larger than the sum of its proper divisors (267379).

9891617 is a wasteful number, since it uses less digits than its factorization.

9891617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267378.

The product of its digits is 27216, while the sum is 41.

The square root of 9891617 is about 3145.0941162388. The cubic root of 9891617 is about 214.6622929787.

The spelling of 9891617 in words is "nine million, eight hundred ninety-one thousand, six hundred seventeen".