9661811 has 4 divisors (see below), whose sum is σ = 9703512. Its totient is φ = 9620112.

The previous prime is 9661787. The next prime is 9661829. The reversal of 9661811 is 1181669.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9661811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9661871) 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, 20501 + ... + 20966.

It is an arithmetic number, because the mean of its divisors is an integer number (2425878).

Almost surely, 2^9661811 is an apocalyptic number.

9661811 is a deficient number, since it is larger than the sum of its proper divisors (41701).

9661811 is a wasteful number, since it uses less digits than its factorization.

9661811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41700.

The product of its digits is 2592, while the sum is 32.

The square root of 9661811 is about 3108.3453797801. The cubic root of 9661811 is about 212.9868771625.

The spelling of 9661811 in words is "nine million, six hundred sixty-one thousand, eight hundred eleven".