9776221 has 16 divisors (see below), whose sum is σ = 12265344. Its totient is φ = 7585344.

The previous prime is 9776213. The next prime is 9776227. The reversal of 9776221 is 1226779.

9776221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9776221 - 2³ = 9776213 is a prime.

9776221 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9776227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3810 + ... + 5836.

It is an arithmetic number, because the mean of its divisors is an integer number (766584).

Almost surely, 2^9776221 is an apocalyptic number.

9776221 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9776221 is a deficient number, since it is larger than the sum of its proper divisors (2489123).

9776221 is a wasteful number, since it uses less digits than its factorization.

9776221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100.

The product of its digits is 10584, while the sum is 34.

The square root of 9776221 is about 3126.6949003700. The cubic root of 9776221 is about 213.8242727197.

The spelling of 9776221 in words is "nine million, seven hundred seventy-six thousand, two hundred twenty-one".