1841891 has 2 divisors, whose sum is σ = 1841892. Its totient is φ = 1841890.

The previous prime is 1841869. The next prime is 1841911. The reversal of 1841891 is 1981481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1841891 is a prime.

It is a Chen prime.

It is equal to p₁₃₇₉₆₆ and since 1841891 and 137966 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1841821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920945 + 920946.

It is an arithmetic number, because the mean of its divisors is an integer number (920946).

2^1841891 is an apocalyptic number.

1841891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1841891 is an equidigital number, since it uses as much as digits as its factorization.

1841891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 32.

The square root of 1841891 is about 1357.1628494768. The cubic root of 1841891 is about 122.5804774526.

The spelling of 1841891 in words is "one million, eight hundred forty-one thousand, eight hundred ninety-one".