821628263 has 2 divisors, whose sum is σ = 821628264. Its totient is φ = 821628262.

The previous prime is 821628211. The next prime is 821628271. The reversal of 821628263 is 362826128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 821628263 - 2⁸ = 821628007 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821648263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410814131 + 410814132.

It is an arithmetic number, because the mean of its divisors is an integer number (410814132).

Almost surely, 2^821628263 is an apocalyptic number.

821628263 is a deficient number, since it is larger than the sum of its proper divisors (1).

821628263 is an equidigital number, since it uses as much as digits as its factorization.

821628263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 821628263 is about 28664.0587321475. The cubic root of 821628263 is about 936.6092804064.

The spelling of 821628263 in words is "eight hundred twenty-one million, six hundred twenty-eight thousand, two hundred sixty-three".