9205661 has 4 divisors (see below), whose sum is σ = 9217824. Its totient is φ = 9193500.

The previous prime is 9205649. The next prime is 9205697. The reversal of 9205661 is 1665029.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9205661 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 (9205601) 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, 4865 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (2304456).

Almost surely, 2^9205661 is an apocalyptic number.

It is an amenable number.

9205661 is a deficient number, since it is larger than the sum of its proper divisors (12163).

9205661 is a wasteful number, since it uses less digits than its factorization.

9205661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12162.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 9205661 is about 3034.0832223260. The cubic root of 9205661 is about 209.5808798697.

The spelling of 9205661 in words is "nine million, two hundred five thousand, six hundred sixty-one".