819121883 has 2 divisors, whose sum is σ = 819121884. Its totient is φ = 819121882.

The previous prime is 819121871. The next prime is 819121949. The reversal of 819121883 is 388121918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819121883 - 2⁸ = 819121627 is a prime.

It is equal to p_42078749 and since 819121883 and 42078749 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 819121883.

It is not a weakly prime, because it can be changed into another prime (819121813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409560941 + 409560942.

It is an arithmetic number, because the mean of its divisors is an integer number (409560942).

Almost surely, 2^819121883 is an apocalyptic number.

819121883 is a deficient number, since it is larger than the sum of its proper divisors (1).

819121883 is an equidigital number, since it uses as much as digits as its factorization.

819121883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 41.

The square root of 819121883 is about 28620.3054316337. The cubic root of 819121883 is about 935.6559336820.

The spelling of 819121883 in words is "eight hundred nineteen million, one hundred twenty-one thousand, eight hundred eighty-three".