1622221 has 4 divisors (see below), whose sum is σ = 1631772. Its totient is φ = 1612672.

The previous prime is 1622209. The next prime is 1622233. The reversal of 1622221 is 1222261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222261 = 107 ⋅11423.

It is an interprime number because it is at equal distance from previous prime (1622209) and next prime (1622233).

It can be written as a sum of positive squares in 2 ways, for example, as 837225 + 784996 = 915^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622221 - 2⁵ = 1622189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1622195 and 1622204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1692221) 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, 4516 + ... + 4861.

It is an arithmetic number, because the mean of its divisors is an integer number (407943).

2^1622221 is an apocalyptic number.

It is an amenable number.

1622221 is a deficient number, since it is larger than the sum of its proper divisors (9551).

1622221 is an equidigital number, since it uses as much as digits as its factorization.

1622221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9550.

The product of its digits is 96, while the sum is 16.

The square root of 1622221 is about 1273.6643984975. The cubic root of 1622221 is about 117.4996770777.

Adding to 1622221 its reverse (1222261), we get a palindrome (2844482).

The spelling of 1622221 in words is "one million, six hundred twenty-two thousand, two hundred twenty-one".