9659921 has 2 divisors, whose sum is σ = 9659922. Its totient is φ = 9659920.

The previous prime is 9659911. The next prime is 9659953. The reversal of 9659921 is 1299569.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7349521 + 2310400 = 2711^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 9659921 - 2⁶ = 9659857 is a prime.

It is not a weakly prime, because it can be changed into another prime (9659911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4829960 + 4829961.

It is an arithmetic number, because the mean of its divisors is an integer number (4829961).

Almost surely, 2^9659921 is an apocalyptic number.

It is an amenable number.

9659921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9659921 is an equidigital number, since it uses as much as digits as its factorization.

9659921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 41.

The square root of 9659921 is about 3108.0413446413. The cubic root of 9659921 is about 212.9729884120.

The spelling of 9659921 in words is "nine million, six hundred fifty-nine thousand, nine hundred twenty-one".