163715221 has 2 divisors, whose sum is σ = 163715222. Its totient is φ = 163715220.

The previous prime is 163715197. The next prime is 163715291. The reversal of 163715221 is 122517361.

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., 137592900 + 26122321 = 11730^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 163715221 - 2¹³ = 163707029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163715221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163715291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81857610 + 81857611.

It is an arithmetic number, because the mean of its divisors is an integer number (81857611).

Almost surely, 2^163715221 is an apocalyptic number.

It is an amenable number.

163715221 is a deficient number, since it is larger than the sum of its proper divisors (1).

163715221 is an equidigital number, since it uses as much as digits as its factorization.

163715221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 163715221 is about 12795.1248919266. The cubic root of 163715221 is about 547.0533554898.

The spelling of 163715221 in words is "one hundred sixty-three million, seven hundred fifteen thousand, two hundred twenty-one".