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BaseRepresentation
bin100101010010111010101
32022002102000
410222113111
5303101401
642105513
713246656
oct4522725
92262360
101222101
11765201
124ab299
1333a34a
1423b52d
15192186
hex12a5d5

1222101 has 8 divisors (see below), whose sum is σ = 1810560. Its totient is φ = 814716.

The previous prime is 1222097. The next prime is 1222129. The reversal of 1222101 is 1012221.

It is not a de Polignac number, because 1222101 - 22 = 1222097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22605 + ... + 22658.

It is an arithmetic number, because the mean of its divisors is an integer number (226320).

21222101 is an apocalyptic number.

It is an amenable number.

1222101 is a deficient number, since it is larger than the sum of its proper divisors (588459).

1222101 is an equidigital number, since it uses as much as digits as its factorization.

1222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45272 (or 45266 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1222101 is about 1105.4867706128. The cubic root of 1222101 is about 106.9142761154.

Adding to 1222101 its reverse (1012221), we get a palindrome (2234322).

The spelling of 1222101 in words is "one million, two hundred twenty-two thousand, one hundred one".

Divisors: 1 3 9 27 45263 135789 407367 1222101