9661111 has 4 divisors (see below), whose sum is σ = 9885832. Its totient is φ = 9436392.

The previous prime is 9661109. The next prime is 9661129. The reversal of 9661111 is 1111669.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111669 = 13 ⋅85513.

It is a cyclic number.

It is not a de Polignac number, because 9661111 - 2¹ = 9661109 is a prime.

It is a Duffinian number.

9661111 is a modest number, since divided by 1111 gives 966 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 (9661511) 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, 112296 + ... + 112381.

It is an arithmetic number, because the mean of its divisors is an integer number (2471458).

Almost surely, 2^9661111 is an apocalyptic number.

9661111 is a deficient number, since it is larger than the sum of its proper divisors (224721).

9661111 is a wasteful number, since it uses less digits than its factorization.

9661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224720.

The product of its digits is 324, while the sum is 25.

The square root of 9661111 is about 3108.2327776407. The cubic root of 9661111 is about 212.9817333920.

The spelling of 9661111 in words is "nine million, six hundred sixty-one thousand, one hundred eleven".