9739661 has 4 divisors (see below), whose sum is σ = 9904800. Its totient is φ = 9574524.

The previous prime is 9739643. The next prime is 9739699. The reversal of 9739661 is 1669379.

It is a happy number.

9739661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1669379 = 83 ⋅20113.

It is a cyclic number.

It is not a de Polignac number, because 9739661 - 2¹⁴ = 9723277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9739061) 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, 82481 + ... + 82598.

It is an arithmetic number, because the mean of its divisors is an integer number (2476200).

Almost surely, 2^9739661 is an apocalyptic number.

It is an amenable number.

9739661 is a deficient number, since it is larger than the sum of its proper divisors (165139).

9739661 is a wasteful number, since it uses less digits than its factorization.

9739661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165138.

The product of its digits is 61236, while the sum is 41.

The square root of 9739661 is about 3120.8429950896. The cubic root of 9739661 is about 213.5573945262.

The spelling of 9739661 in words is "nine million, seven hundred thirty-nine thousand, six hundred sixty-one".