9956221 has 4 divisors (see below), whose sum is σ = 10861344. Its totient is φ = 9051100.

The previous prime is 9956213. The next prime is 9956227. The reversal of 9956221 is 1226599.

9956221 is digitally balanced in base 3, 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: 1226599 = 11 ⋅111509.

It is a cyclic number.

It is not a de Polignac number, because 9956221 - 2³ = 9956213 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 (9956227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452545 + ... + 452566.

It is an arithmetic number, because the mean of its divisors is an integer number (2715336).

Almost surely, 2^9956221 is an apocalyptic number.

It is an amenable number.

9956221 is a deficient number, since it is larger than the sum of its proper divisors (905123).

9956221 is a wasteful number, since it uses less digits than its factorization.

9956221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905122.

The product of its digits is 9720, while the sum is 34.

The square root of 9956221 is about 3155.3479998251. The cubic root of 9956221 is about 215.1286124307.

The spelling of 9956221 in words is "nine million, nine hundred fifty-six thousand, two hundred twenty-one".