1941991 has 4 divisors (see below), whose sum is σ = 1949184. Its totient is φ = 1934800.

The previous prime is 1941983. The next prime is 1942001. The reversal of 1941991 is 1991491.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1941991 - 2³ = 1941983 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 (1941931) 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 3 ways as a sum of consecutive naturals, for example, 3175 + ... + 3736.

It is an arithmetic number, because the mean of its divisors is an integer number (487296).

2^1941991 is an apocalyptic number.

1941991 is a deficient number, since it is larger than the sum of its proper divisors (7193).

1941991 is an equidigital number, since it uses as much as digits as its factorization.

1941991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7192.

The product of its digits is 2916, while the sum is 34.

The square root of 1941991 is about 1393.5533717802. The cubic root of 1941991 is about 124.7620218855.

The spelling of 1941991 in words is "one million, nine hundred forty-one thousand, nine hundred ninety-one".