163339921 has 2 divisors, whose sum is σ = 163339922. Its totient is φ = 163339920.

The previous prime is 163339901. The next prime is 163339931. The reversal of 163339921 is 129933361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162205696 + 1134225 = 12736^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 163339921 - 2¹⁷ = 163208849 is a prime.

It is not a weakly prime, because it can be changed into another prime (163339901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81669960 + 81669961.

It is an arithmetic number, because the mean of its divisors is an integer number (81669961).

Almost surely, 2^163339921 is an apocalyptic number.

It is an amenable number.

163339921 is a deficient number, since it is larger than the sum of its proper divisors (1).

163339921 is an equidigital number, since it uses as much as digits as its factorization.

163339921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 37.

The square root of 163339921 is about 12780.4507354005. The cubic root of 163339921 is about 546.6350148159.

The spelling of 163339921 in words is "one hundred sixty-three million, three hundred thirty-nine thousand, nine hundred twenty-one".