9765661 has 2 divisors, whose sum is σ = 9765662. Its totient is φ = 9765660.

The previous prime is 9765653. The next prime is 9765671. The reversal of 9765661 is 1665679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 36 = 3125^2 + 6^2 .

It is an emirp because it is prime and its reverse (1665679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9765661 - 2³ = 9765653 is a prime.

9765661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9765611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4882830 + 4882831.

It is an arithmetic number, because the mean of its divisors is an integer number (4882831).

Almost surely, 2^9765661 is an apocalyptic number.

It is an amenable number.

9765661 is a deficient number, since it is larger than the sum of its proper divisors (1).

9765661 is an equidigital number, since it uses as much as digits as its factorization.

9765661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 9765661 is about 3125.0057599947. The cubic root of 9765661 is about 213.7472559866.

The spelling of 9765661 in words is "nine million, seven hundred sixty-five thousand, six hundred sixty-one".