819822881 has 2 divisors, whose sum is σ = 819822882. Its totient is φ = 819822880.

The previous prime is 819822863. The next prime is 819822893. The reversal of 819822881 is 188228918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 603144481 + 216678400 = 24559^2 + 14720^2 .

It is a cyclic number.

It is not a de Polignac number, because 819822881 - 2¹⁰ = 819821857 is a prime.

It is a super-2 number, since 2×819822881² = 1344219112422280322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (819822851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409911440 + 409911441.

It is an arithmetic number, because the mean of its divisors is an integer number (409911441).

Almost surely, 2^819822881 is an apocalyptic number.

It is an amenable number.

819822881 is a deficient number, since it is larger than the sum of its proper divisors (1).

819822881 is an equidigital number, since it uses as much as digits as its factorization.

819822881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 47.

The square root of 819822881 is about 28632.5493276446. The cubic root of 819822881 is about 935.9227665502.

The spelling of 819822881 in words is "eight hundred nineteen million, eight hundred twenty-two thousand, eight hundred eighty-one".