163322821 has 2 divisors, whose sum is σ = 163322822. Its totient is φ = 163322820.

The previous prime is 163322807. The next prime is 163322881. The reversal of 163322821 is 128223361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161645796 + 1677025 = 12714^2 + 1295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163322821 is a prime.

It is equal to p_9150247 and since 163322821 and 9150247 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163322821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163322881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81661410 + 81661411.

It is an arithmetic number, because the mean of its divisors is an integer number (81661411).

Almost surely, 2^163322821 is an apocalyptic number.

It is an amenable number.

163322821 is a deficient number, since it is larger than the sum of its proper divisors (1).

163322821 is an equidigital number, since it uses as much as digits as its factorization.

163322821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 163322821 is about 12779.7817274005. The cubic root of 163322821 is about 546.6159384731.

The spelling of 163322821 in words is "one hundred sixty-three million, three hundred twenty-two thousand, eight hundred twenty-one".