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1220101 = 8913709
BaseRepresentation
bin100101001111000000101
32021222122221
410221320011
5303020401
642052341
713241101
oct4517005
92258587
101220101
11763753
124aa0b1
1333946c
1423a901
151917a1
hex129e05

1220101 has 4 divisors (see below), whose sum is σ = 1233900. Its totient is φ = 1206304.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220101 is 1010221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1010221 = 6116561.

It can be written as a sum of positive squares in 2 ways, for example, as 656100 + 564001 = 810^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220101 - 21 = 1220099 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 (1220171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6766 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (308475).

21220101 is an apocalyptic number.

It is an amenable number.

1220101 is a deficient number, since it is larger than the sum of its proper divisors (13799).

1220101 is an equidigital number, since it uses as much as digits as its factorization.

1220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13798.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1220101 is about 1104.5818213243. The cubic root of 1220101 is about 106.8559216085.

Adding to 1220101 its reverse (1010221), we get a palindrome (2230322).

The spelling of 1220101 in words is "one million, two hundred twenty thousand, one hundred one".

Divisors: 1 89 13709 1220101