819984497 has 2 divisors, whose sum is σ = 819984498. Its totient is φ = 819984496.

The previous prime is 819984439. The next prime is 819984521. The reversal of 819984497 is 794489918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 454371856 + 365612641 = 21316^2 + 19121^2 .

It is a cyclic number.

It is not a de Polignac number, because 819984497 - 2⁸ = 819984241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (819984097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409992248 + 409992249.

It is an arithmetic number, because the mean of its divisors is an integer number (409992249).

Almost surely, 2^819984497 is an apocalyptic number.

It is an amenable number.

819984497 is a deficient number, since it is larger than the sum of its proper divisors (1).

819984497 is an equidigital number, since it uses as much as digits as its factorization.

819984497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 59.

The square root of 819984497 is about 28635.3714311514. The cubic root of 819984497 is about 935.9842636365.

The spelling of 819984497 in words is "eight hundred nineteen million, nine hundred eighty-four thousand, four hundred ninety-seven".