884972821 has 2 divisors, whose sum is σ = 884972822. Its totient is φ = 884972820.

The previous prime is 884972819. The next prime is 884972831. The reversal of 884972821 is 128279488.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878470321 + 6502500 = 29639^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 884972821 - 2¹ = 884972819 is a prime.

Together with 884972819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (884972831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 442486410 + 442486411.

It is an arithmetic number, because the mean of its divisors is an integer number (442486411).

Almost surely, 2^884972821 is an apocalyptic number.

It is an amenable number.

884972821 is a deficient number, since it is larger than the sum of its proper divisors (1).

884972821 is an equidigital number, since it uses as much as digits as its factorization.

884972821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 49.

The square root of 884972821 is about 29748.4927517345. The cubic root of 884972821 is about 960.0856481022.

The spelling of 884972821 in words is "eight hundred eighty-four million, nine hundred seventy-two thousand, eight hundred twenty-one".