163073921 has 2 divisors, whose sum is σ = 163073922. Its totient is φ = 163073920.

The previous prime is 163073891. The next prime is 163073971. The reversal of 163073921 is 129370361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121793296 + 41280625 = 11036^2 + 6425^2 .

It is an emirp because it is prime and its reverse (129370361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163073921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163073971) 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 as a sum of consecutive naturals, namely, 81536960 + 81536961.

It is an arithmetic number, because the mean of its divisors is an integer number (81536961).

Almost surely, 2^163073921 is an apocalyptic number.

It is an amenable number.

163073921 is a deficient number, since it is larger than the sum of its proper divisors (1).

163073921 is an equidigital number, since it uses as much as digits as its factorization.

163073921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 163073921 is about 12770.0399764449. The cubic root of 163073921 is about 546.3381208387.

The spelling of 163073921 in words is "one hundred sixty-three million, seventy-three thousand, nine hundred twenty-one".