821005795 has 4 divisors (see below), whose sum is σ = 985206960. Its totient is φ = 656804632.

The previous prime is 821005793. The next prime is 821005811. The reversal of 821005795 is 597500128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 821005795 - 2¹ = 821005793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (821005793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82100575 + ... + 82100584.

It is an arithmetic number, because the mean of its divisors is an integer number (246301740).

Almost surely, 2^821005795 is an apocalyptic number.

821005795 is a deficient number, since it is larger than the sum of its proper divisors (164201165).

821005795 is a wasteful number, since it uses less digits than its factorization.

821005795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164201164.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 821005795 is about 28653.1986870576. The cubic root of 821005795 is about 936.3726946641.

The spelling of 821005795 in words is "eight hundred twenty-one million, five thousand, seven hundred ninety-five".