9955921 has 2 divisors, whose sum is σ = 9955922. Its totient is φ = 9955920.

The previous prime is 9955909. The next prime is 9955937. The reversal of 9955921 is 1295599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8294400 + 1661521 = 2880^2 + 1289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9955921 is a prime.

It is not a weakly prime, because it can be changed into another prime (9955901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4977960 + 4977961.

It is an arithmetic number, because the mean of its divisors is an integer number (4977961).

Almost surely, 2^9955921 is an apocalyptic number.

It is an amenable number.

9955921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9955921 is an equidigital number, since it uses as much as digits as its factorization.

9955921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450, while the sum is 40.

The square root of 9955921 is about 3155.3004611289. The cubic root of 9955921 is about 215.1264516633.

The spelling of 9955921 in words is "nine million, nine hundred fifty-five thousand, nine hundred twenty-one".