1910891 has 2 divisors, whose sum is σ = 1910892. Its totient is φ = 1910890.

The previous prime is 1910873. The next prime is 1910899. The reversal of 1910891 is 1980191.

It is a strong prime.

It is an emirp because it is prime and its reverse (1980191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1910891 - 2⁶ = 1910827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1910899) 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 as a sum of consecutive naturals, namely, 955445 + 955446.

It is an arithmetic number, because the mean of its divisors is an integer number (955446).

2^1910891 is an apocalyptic number.

1910891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1910891 is an equidigital number, since it uses as much as digits as its factorization.

1910891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1910891 is about 1382.3498110102. The cubic root of 1910891 is about 124.0924345471.

The spelling of 1910891 in words is "one million, nine hundred ten thousand, eight hundred ninety-one".