822793921 has 4 divisors (see below), whose sum is σ = 824942592. Its totient is φ = 820645252.

The previous prime is 822793883. The next prime is 822793987. The reversal of 822793921 is 129397228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 822793921 - 2¹³ = 822785729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (822793991) 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 in 3 ways as a sum of consecutive naturals, for example, 1073761 + ... + 1074526.

It is an arithmetic number, because the mean of its divisors is an integer number (206235648).

Almost surely, 2^822793921 is an apocalyptic number.

It is an amenable number.

822793921 is a deficient number, since it is larger than the sum of its proper divisors (2148671).

822793921 is a wasteful number, since it uses less digits than its factorization.

822793921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148670.

The product of its digits is 108864, while the sum is 43.

The square root of 822793921 is about 28684.3846195103. The cubic root of 822793921 is about 937.0519989503.

The spelling of 822793921 in words is "eight hundred twenty-two million, seven hundred ninety-three thousand, nine hundred twenty-one".