828643091 has 2 divisors, whose sum is σ = 828643092. Its totient is φ = 828643090.

The previous prime is 828643043. The next prime is 828643111. The reversal of 828643091 is 190346828.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-828643091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (828643031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414321545 + 414321546.

It is an arithmetic number, because the mean of its divisors is an integer number (414321546).

Almost surely, 2^828643091 is an apocalyptic number.

828643091 is a deficient number, since it is larger than the sum of its proper divisors (1).

828643091 is an equidigital number, since it uses as much as digits as its factorization.

828643091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 828643091 is about 28786.1614495577. The cubic root of 828643091 is about 939.2672314755.

The spelling of 828643091 in words is "eight hundred twenty-eight million, six hundred forty-three thousand, ninety-one".