1921241 has 6 divisors (see below), whose sum is σ = 2234970. Its totient is φ = 1646736.

The previous prime is 1921229. The next prime is 1921247. The reversal of 1921241 is 1421291.

It can be written as a sum of positive squares in only one way, i.e., 1901641 + 19600 = 1379^2 + 140^2 .

It is not a de Polignac number, because 1921241 - 2⁶ = 1921177 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921247) 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 5 ways as a sum of consecutive naturals, for example, 19556 + ... + 19653.

It is an arithmetic number, because the mean of its divisors is an integer number (372495).

2^1921241 is an apocalyptic number.

It is an amenable number.

1921241 is a deficient number, since it is larger than the sum of its proper divisors (313729).

1921241 is an equidigital number, since it uses as much as digits as its factorization.

1921241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39223 (or 39216 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 1921241 is about 1386.0883810205. The cubic root of 1921241 is about 124.3160727732.

The spelling of 1921241 in words is "one million, nine hundred twenty-one thousand, two hundred forty-one".