821143361 has 2 divisors, whose sum is σ = 821143362. Its totient is φ = 821143360.

The previous prime is 821143327. The next prime is 821143373. The reversal of 821143361 is 163341128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684136336 + 137007025 = 26156^2 + 11705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821143361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (821193361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410571680 + 410571681.

It is an arithmetic number, because the mean of its divisors is an integer number (410571681).

Almost surely, 2^821143361 is an apocalyptic number.

It is an amenable number.

821143361 is a deficient number, since it is larger than the sum of its proper divisors (1).

821143361 is an equidigital number, since it uses as much as digits as its factorization.

821143361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 821143361 is about 28655.5991212887. The cubic root of 821143361 is about 936.4249906215.

Adding to 821143361 its reverse (163341128), we get a palindrome (984484489).

The spelling of 821143361 in words is "eight hundred twenty-one million, one hundred forty-three thousand, three hundred sixty-one".