9720111 has 4 divisors (see below), whose sum is σ = 12960152. Its totient is φ = 6480072.

The previous prime is 9720103. The next prime is 9720119. The reversal of 9720111 is 1110279.

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 (9720103) and next prime (9720119).

It is not a de Polignac number, because 9720111 - 2³ = 9720103 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 (9720119) 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, 1620016 + ... + 1620021.

It is an arithmetic number, because the mean of its divisors is an integer number (3240038).

Almost surely, 2^9720111 is an apocalyptic number.

9720111 is a deficient number, since it is larger than the sum of its proper divisors (3240041).

9720111 is a wasteful number, since it uses less digits than its factorization.

9720111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240040.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 9720111 is about 3117.7092552065. The cubic root of 9720111 is about 213.4144106432.

The spelling of 9720111 in words is "nine million, seven hundred twenty thousand, one hundred eleven".