818204477 has 2 divisors, whose sum is σ = 818204478. Its totient is φ = 818204476.

The previous prime is 818204423. The next prime is 818204479. The reversal of 818204477 is 774402818.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 796029796 + 22174681 = 28214^2 + 4709^2 .

It is a cyclic number.

It is not a de Polignac number, because 818204477 - 2¹⁴ = 818188093 is a prime.

Together with 818204479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818204479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409102238 + 409102239.

It is an arithmetic number, because the mean of its divisors is an integer number (409102239).

Almost surely, 2^818204477 is an apocalyptic number.

It is an amenable number.

818204477 is a deficient number, since it is larger than the sum of its proper divisors (1).

818204477 is an equidigital number, since it uses as much as digits as its factorization.

818204477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100352, while the sum is 41.

The square root of 818204477 is about 28604.2737541088. The cubic root of 818204477 is about 935.3064956469.

The spelling of 818204477 in words is "eight hundred eighteen million, two hundred four thousand, four hundred seventy-seven".