9906211 has 8 divisors (see below), whose sum is σ = 11585024. Its totient is φ = 8293320.

The previous prime is 9906209. The next prime is 9906227. The reversal of 9906211 is 1126099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9906211 - 2¹ = 9906209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9906211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9906241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16155 + ... + 16756.

It is an arithmetic number, because the mean of its divisors is an integer number (1448128).

Almost surely, 2^9906211 is an apocalyptic number.

9906211 is a deficient number, since it is larger than the sum of its proper divisors (1678813).

9906211 is a wasteful number, since it uses less digits than its factorization.

9906211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32961.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 9906211 is about 3147.4133824460. The cubic root of 9906211 is about 214.7678113543.

The spelling of 9906211 in words is "nine million, nine hundred six thousand, two hundred eleven".