1081221 has 4 divisors (see below), whose sum is σ = 1441632. Its totient is φ = 720812.

The previous prime is 1081219. The next prime is 1081229. The reversal of 1081221 is 1221801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1081221 - 2¹ = 1081219 is a prime.

It is a D-number.

1081221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1081221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081229) 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 3 ways as a sum of consecutive naturals, for example, 180201 + ... + 180206.

It is an arithmetic number, because the mean of its divisors is an integer number (360408).

2^1081221 is an apocalyptic number.

It is an amenable number.

1081221 is a deficient number, since it is larger than the sum of its proper divisors (360411).

1081221 is an equidigital number, since it uses as much as digits as its factorization.

1081221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360410.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1081221 is about 1039.8177724967. The cubic root of 1081221 is about 102.6372066951.

The spelling of 1081221 in words is "one million, eighty-one thousand, two hundred twenty-one".