163221523 has 2 divisors, whose sum is σ = 163221524. Its totient is φ = 163221522.

The previous prime is 163221491. The next prime is 163221551. The reversal of 163221523 is 325122361.

It is a strong prime.

It is an emirp because it is prime and its reverse (325122361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163221523 - 2⁵ = 163221491 is a prime.

It is not a weakly prime, because it can be changed into another prime (163221623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81610761 + 81610762.

It is an arithmetic number, because the mean of its divisors is an integer number (81610762).

Almost surely, 2^163221523 is an apocalyptic number.

163221523 is a deficient number, since it is larger than the sum of its proper divisors (1).

163221523 is an equidigital number, since it uses as much as digits as its factorization.

163221523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 163221523 is about 12775.8178994536. The cubic root of 163221523 is about 546.5029055800.

Adding to 163221523 its reverse (325122361), we get a palindrome (488343884).

The spelling of 163221523 in words is "one hundred sixty-three million, two hundred twenty-one thousand, five hundred twenty-three".