9971111 has 4 divisors (see below), whose sum is σ = 9997800. Its totient is φ = 9944424.

The previous prime is 9971107. The next prime is 9971123. The reversal of 9971111 is 1111799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111799 = 13 ⋅85523.

It is a cyclic number.

It is not a de Polignac number, because 9971111 - 2² = 9971107 is a prime.

It is a Duffinian number.

9971111 is a modest number, since divided by 1111 gives 997 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12776 + ... + 13533.

It is an arithmetic number, because the mean of its divisors is an integer number (2499450).

Almost surely, 2^9971111 is an apocalyptic number.

9971111 is a deficient number, since it is larger than the sum of its proper divisors (26689).

9971111 is a wasteful number, since it uses less digits than its factorization.

9971111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26688.

The product of its digits is 567, while the sum is 29.

The square root of 9971111 is about 3157.7066044837. The cubic root of 9971111 is about 215.2358040210.

The spelling of 9971111 in words is "nine million, nine hundred seventy-one thousand, one hundred eleven".