821116733 has 2 divisors, whose sum is σ = 821116734. Its totient is φ = 821116732.

The previous prime is 821116697. The next prime is 821116739. The reversal of 821116733 is 337611128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805537924 + 15578809 = 28382^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 821116733 - 2¹² = 821112637 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 821116733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821116739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410558366 + 410558367.

It is an arithmetic number, because the mean of its divisors is an integer number (410558367).

Almost surely, 2^821116733 is an apocalyptic number.

It is an amenable number.

821116733 is a deficient number, since it is larger than the sum of its proper divisors (1).

821116733 is an equidigital number, since it uses as much as digits as its factorization.

821116733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 821116733 is about 28655.1344962818. The cubic root of 821116733 is about 936.4148683963.

The spelling of 821116733 in words is "eight hundred twenty-one million, one hundred sixteen thousand, seven hundred thirty-three".