9891143 has 4 divisors (see below), whose sum is σ = 10038840. Its totient is φ = 9743448.

The previous prime is 9891137. The next prime is 9891149. The reversal of 9891143 is 3411989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3411989 = 7 ⋅487427.

It is an interprime number because it is at equal distance from previous prime (9891137) and next prime (9891149).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9891143 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 (9891149) 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, 73748 + ... + 73881.

It is an arithmetic number, because the mean of its divisors is an integer number (2509710).

Almost surely, 2^9891143 is an apocalyptic number.

9891143 is a deficient number, since it is larger than the sum of its proper divisors (147697).

9891143 is a wasteful number, since it uses less digits than its factorization.

9891143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147696.

The product of its digits is 7776, while the sum is 35.

The square root of 9891143 is about 3145.0187598805. The cubic root of 9891143 is about 214.6588640971.

The spelling of 9891143 in words is "nine million, eight hundred ninety-one thousand, one hundred forty-three".