163013821 has 2 divisors, whose sum is σ = 163013822. Its totient is φ = 163013820.

The previous prime is 163013803. The next prime is 163013861. The reversal of 163013821 is 128310361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91948921 + 71064900 = 9589^2 + 8430^2 .

It is a cyclic number.

It is not a de Polignac number, because 163013821 - 2¹³ = 163005629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163013861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81506910 + 81506911.

It is an arithmetic number, because the mean of its divisors is an integer number (81506911).

Almost surely, 2^163013821 is an apocalyptic number.

It is an amenable number.

163013821 is a deficient number, since it is larger than the sum of its proper divisors (1).

163013821 is an equidigital number, since it uses as much as digits as its factorization.

163013821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 163013821 is about 12767.6865954643. The cubic root of 163013821 is about 546.2709959516.

It can be divided in two parts, 1630 and 13821, that added together give a palindrome (15451).

The spelling of 163013821 in words is "one hundred sixty-three million, thirteen thousand, eight hundred twenty-one".