9891671 has 4 divisors (see below), whose sum is σ = 10473552. Its totient is φ = 9309792.

The previous prime is 9891653. The next prime is 9891689. The reversal of 9891671 is 1761989.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (9891653) and next prime (9891689).

It is a cyclic number.

It is not a de Polignac number, because 9891671 - 2¹⁴ = 9875287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891601) 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, 290915 + ... + 290948.

It is an arithmetic number, because the mean of its divisors is an integer number (2618388).

Almost surely, 2^9891671 is an apocalyptic number.

9891671 is a deficient number, since it is larger than the sum of its proper divisors (581881).

9891671 is a wasteful number, since it uses less digits than its factorization.

9891671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581880.

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

The square root of 9891671 is about 3145.1027010258. The cubic root of 9891671 is about 214.6626836039.

The spelling of 9891671 in words is "nine million, eight hundred ninety-one thousand, six hundred seventy-one".