816955361 has 2 divisors, whose sum is σ = 816955362. Its totient is φ = 816955360.

The previous prime is 816955357. The next prime is 816955427. The reversal of 816955361 is 163559618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 775288336 + 41667025 = 27844^2 + 6455^2 .

It is a cyclic number.

It is not a de Polignac number, because 816955361 - 2² = 816955357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (816955351) 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, 408477680 + 408477681.

It is an arithmetic number, because the mean of its divisors is an integer number (408477681).

Almost surely, 2^816955361 is an apocalyptic number.

It is an amenable number.

816955361 is a deficient number, since it is larger than the sum of its proper divisors (1).

816955361 is an equidigital number, since it uses as much as digits as its factorization.

816955361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 44.

The square root of 816955361 is about 28582.4309847850. The cubic root of 816955361 is about 934.8302897677.

The spelling of 816955361 in words is "eight hundred sixteen million, nine hundred fifty-five thousand, three hundred sixty-one".