1221185 has 32 divisors (see below), whose sum is σ = 1838592. Its totient is φ = 760320.

The previous prime is 1221167. The next prime is 1221193. The reversal of 1221185 is 5811221.

It is a happy number.

It is not a de Polignac number, because 1221185 - 2¹² = 1217089 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29765 + ... + 29805.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2^1221185 is an apocalyptic number.

It is an amenable number.

1221185 is a deficient number, since it is larger than the sum of its proper divisors (617407).

1221185 is a wasteful number, since it uses less digits than its factorization.

1221185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113.

The product of its digits is 160, while the sum is 20.

The square root of 1221185 is about 1105.0723958185. The cubic root of 1221185 is about 106.8875576594.

Subtracting from 1221185 its product of digits (160), we obtain a square (1221025 = 1105²).

The spelling of 1221185 in words is "one million, two hundred twenty-one thousand, one hundred eighty-five".