1220191 has 8 divisors (see below), whose sum is σ = 1439744. Its totient is φ = 1011960.

The previous prime is 1220171. The next prime is 1220203. The reversal of 1220191 is 1910221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220191 - 2⁹ = 1219679 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2595 + ... + 3028.

It is an arithmetic number, because the mean of its divisors is an integer number (179968).

2^1220191 is an apocalyptic number.

1220191 is a deficient number, since it is larger than the sum of its proper divisors (219553).

1220191 is an equidigital number, since it uses as much as digits as its factorization.

1220191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5661.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1220191 is about 1104.6225599724. The cubic root of 1220191 is about 106.8585489310.

The spelling of 1220191 in words is "one million, two hundred twenty thousand, one hundred ninety-one".