10819891 has 2 divisors, whose sum is σ = 10819892. Its totient is φ = 10819890.

The previous prime is 10819889. The next prime is 10819937. The reversal of 10819891 is 19891801.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10819891 - 2¹ = 10819889 is a prime.

Together with 10819889, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 10819891.

It is not a weakly prime, because it can be changed into another prime (10819691) 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, 5409945 + 5409946.

It is an arithmetic number, because the mean of its divisors is an integer number (5409946).

Almost surely, 2^10819891 is an apocalyptic number.

10819891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10819891 is an equidigital number, since it uses as much as digits as its factorization.

10819891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 10819891 is about 3289.3602721502. The cubic root of 10819891 is about 221.1775086759.

The spelling of 10819891 in words is "ten million, eight hundred nineteen thousand, eight hundred ninety-one".