819837281 has 2 divisors, whose sum is σ = 819837282. Its totient is φ = 819837280.

The previous prime is 819837241. The next prime is 819837371. The reversal of 819837281 is 182738918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 772006225 + 47831056 = 27785^2 + 6916^2 .

It is a cyclic number.

It is not a de Polignac number, because 819837281 - 2¹⁰ = 819836257 is a prime.

It is a super-2 number, since 2×819837281² = 1344266334634945922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (819837241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409918640 + 409918641.

It is an arithmetic number, because the mean of its divisors is an integer number (409918641).

Almost surely, 2^819837281 is an apocalyptic number.

It is an amenable number.

819837281 is a deficient number, since it is larger than the sum of its proper divisors (1).

819837281 is an equidigital number, since it uses as much as digits as its factorization.

819837281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 47.

The square root of 819837281 is about 28632.8007886061. The cubic root of 819837281 is about 935.9282462740.

The spelling of 819837281 in words is "eight hundred nineteen million, eight hundred thirty-seven thousand, two hundred eighty-one".