9872111 has 2 divisors, whose sum is σ = 9872112. Its totient is φ = 9872110.

The previous prime is 9872099. The next prime is 9872113. The reversal of 9872111 is 1112789.

It is a strong prime.

It is an emirp because it is prime and its reverse (1112789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9872111 - 2⁶ = 9872047 is a prime.

It is a Sophie Germain prime.

Together with 9872113, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9872113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4936055 + 4936056.

It is an arithmetic number, because the mean of its divisors is an integer number (4936056).

Almost surely, 2^9872111 is an apocalyptic number.

9872111 is a deficient number, since it is larger than the sum of its proper divisors (1).

9872111 is an equidigital number, since it uses as much as digits as its factorization.

9872111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 29.

The square root of 9872111 is about 3141.9915658703. The cubic root of 9872111 is about 214.5210973900.

The spelling of 9872111 in words is "nine million, eight hundred seventy-two thousand, one hundred eleven".